# \[ANN\] Elasticsearch Simple Action Plugin **URL:** \ **Category:** Elasticsearch\ **Created:** [June 3, 2014, 3:15pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889 "2014-06-03T15:15:20Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 3, 2014, 3:15pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/1 "2014-06-03T15:15:20Z")
Hi, many of us want to start writing extensions for Elasticsearch. Except submitting pull requests to the core code, one great advantage of Elasticsearch is the plugin mechanism. Here, custom code can be hooked into Elasticsearch, without having to ask for inclusion into the core code. Nevertheless, plugin code can be published on Github and easily included into a running ES instance by using the ES plugin command line tool. Unfortunately, writing plugins is not so easy as it seems. There are many plugins, some of them are very advanced, and finding a starting point for a personal project could be quite hard. Hence, for educational purposes, I wrote a tiny plugin, as a starting point, to demonstrate how a plugin works. The simple plugin is indeed very simple. It makes reuse of the standard search action: - it defines a built-in query (a "match all" query) - it creates a custom action for it - the action is called from Java API - the result of the action (the search response of the "match all" query) is logged The plugin code comes with a junit test. It is available at > **[jprante/elasticsearch-simple-action-plugin](https://github.com/jprante/elasticsearch-simple-action-plugin)** > > elasticsearch-simple-action-plugin - A simple action plugin for Elasticsearch In the hope it is useful, Jörg -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 3, 2014, 5:33pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/2 "2014-06-03T17:33:35Z")
Thank you. About the plugin, I wonder if you install it on all nodes in cluster to make it work or install it in a nondata node? ---
**Author:** ![luizgpsantos](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/luizgpsantos/32/608_2.png) [@luizgpsantos](https://discuss.elastic.co/u/luizgpsantos)\ **Post date:** [June 3, 2014, 5:59pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/3 "2014-06-03T17:59:48Z")
Hi Jörg, Thanks a lot! Some month ago I started to write one plugin and it was really difficult. This skeleton is perfect for a cold start 🙂 On Tue, Jun 3, 2014 at 12:15 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > Hi, > > many of us want to start writing extensions for Elasticsearch. > > Except submitting pull requests to the core code, one great advantage of > Elasticsearch is the plugin mechanism. Here, custom code can be hooked into > Elasticsearch, without having to ask for inclusion into the core code. > Nevertheless, plugin code can be published on Github and easily included > into a running ES instance by using the ES plugin command line tool. > > Unfortunately, writing plugins is not so easy as it seems. There are many > plugins, some of them are very advanced, and finding a starting point for a > personal project could be quite hard. > > Hence, for educational purposes, I wrote a tiny plugin, as a starting > point, to demonstrate how a plugin works. > > The simple plugin is indeed very simple. It makes reuse of the standard > search action: > > - it defines a built-in query (a "match all" query) > > - it creates a custom action for it > > - the action is called from Java API > > - the result of the action (the search response of the "match all" query) > is logged > > The plugin code comes with a junit test. It is available at > > [GitHub - jprante/elasticsearch-simple-action-plugin: A simple action plugin for Elasticsearch](https://github.com/jprante/elasticsearch-simple-action-plugin) > > In the hope it is useful, > > Jörg > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- Luiz Guilherme P. Santos -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAMdL%3DZEcM%3DzRmLk9%2BK7fiZ1hoT1zbcy\_ScYT0F\_8Kx0RzPkm%2BA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAMdL%3DZEcM%3DzRmLk9%2BK7fiZ1hoT1zbcy_ScYT0F_8Kx0RzPkm%2BA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 3, 2014, 7:18pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/4 "2014-06-03T19:18:12Z")
Usually, plugins that extend internal ES functionality should be installed on all nodes. This is easy to remember and preferable from an administrative view. All the nodes in the ES cluster must have access to plugin code under all circumstances, especially when executing actions, mappers, routers, discovery helpers, analyzer code, indexing helpers... In this case, for the simple action demo plugin, you can install it just on the node of the cluster where you want to execute the demo "match\_all" search from. The "match\_all" search is then searching on all the indexes of the cluster. If you want to execute the demo plugin "match\_all" search from other nodes, you would have to install the plugin on those other nodes, too. Jörg On Tue, Jun 3, 2014 at 7:33 PM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > Thank you. About the plugin, I wonder if you install it on all nodes in > cluster to make it work or install it in a nondata node? > > -- > View this message in context: > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4056981.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4056981.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/1401816815837-4056981.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401816815837-4056981.post%40n3.nabble.com) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFkQ4xL5xqrXfH%2BzwSJ0WvyLcNw6S%2B7Z0pTSCuwXHnXWw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFkQ4xL5xqrXfH%2BzwSJ0WvyLcNw6S%2B7Z0pTSCuwXHnXWw%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 3, 2014, 9:48pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/5 "2014-06-03T21:48:44Z")
Thank you Jörg. I see the point. But if the plugin consumes memory (ex. hold a HashMap for customized score), installing it on all nodes may waste memory of the cluster. Is there any way to deal with this issue? ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 3, 2014, 10:16pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/6 "2014-06-03T22:16:31Z")
Not sure if I understand your concern completely - as long as you're doing things right in your code, it should be possible to allocate resources only when required - this holds also for plugins. Jörg On Tue, Jun 3, 2014 at 11:48 PM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > Thank you Jörg. I see the point. But if the plugin consumes memory (ex. > hold > a HashMap for customized score), installing it on all nodes may waste > memory > of the cluster. Is there any way to deal with this issue? > > -- > View this message in context: > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057003.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057003.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/1401832124609-4057003.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401832124609-4057003.post%40n3.nabble.com) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFpp8ybSWqxya9s-hK6qhhBUOTno8pdgX-Ba6YT\_oAHFA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoFpp8ybSWqxya9s-hK6qhhBUOTno8pdgX-Ba6YT_oAHFA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 4, 2014, 12:55am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/7 "2014-06-04T00:55:45Z")
The problem is that only one copy of HashMap is needed to customize score of all documents in the cluster. But as we have to install the plugin on all nodes, the actual memory used is multiplied by the number of nodes in cluster. I try to figure out one way to save the memory. Tried on non-data node, but it seems not working. ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 4, 2014, 8:07am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/8 "2014-06-04T08:07:42Z")
You need resources on all nodes that hold shards, you can not do it with just one instance, because ES index is distributed. Rescoring would be very expensive if you did it on an extra central instance with an extra scatter/gather phase. It is also very expensive in scripting. A better method is a similarity plugin like > **[GitHub - tlrx/elasticsearch-custom-similarity-provider: A custom...](https://github.com/tlrx/elasticsearch-custom-similarity-provider)** > > A custom SimilarityProvider example for Elasticsearch - GitHub - tlrx/elasticsearch-custom-similarity-provider: A custom SimilarityProvider example for Elasticsearch Not sure how your code looks like though, maybe you can share it with the community? Jörg On Wed, Jun 4, 2014 at 2:55 AM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > The problem is that only one copy of HashMap is needed to customize score > of > all documents in the cluster. But as we have to install the plugin on all > nodes, the actual memory used is multiplied by the number of nodes in > cluster. I try to figure out one way to save the memory. Tried on non-data > node, but it seems not working. > > -- > View this message in context: > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH%3D228Y2PvB265Hs4NX1O\_Ac4QBuWXJGcCqKaXFc3a56A%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH%3D228Y2PvB265Hs4NX1O_Ac4QBuWXJGcCqKaXFc3a56A%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 4, 2014, 8:09am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/9 "2014-06-04T08:09:46Z")
Sorry, the plugin is outdated, a better start is by looking at > **[Elasticsearch Platform — Find real-time answers at scale](https://www.elastic.co)** > > Power insights and outcomes with the Elasticsearch Platform and AI. See into your data and find answers that matter with enterprise solutions designed to help you build, observe, and protect. Try Elasticsearch free today. Jörg On Wed, Jun 4, 2014 at 10:07 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > You need resources on all nodes that hold shards, you can not do it with > just one instance, because ES index is distributed. Rescoring would be very > expensive if you did it on an extra central instance with an extra > scatter/gather phase. It is also very expensive in scripting. > > A better method is a similarity plugin like > [GitHub - tlrx/elasticsearch-custom-similarity-provider: A custom SimilarityProvider example for Elasticsearch](https://github.com/tlrx/elasticsearch-custom-similarity-provider) > > Not sure how your code looks like though, maybe you can share it with the > community? > > Jörg > > On Wed, Jun 4, 2014 at 2:55 AM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > > > The problem is that only one copy of HashMap is needed to customize score > > of > > all documents in the cluster. But as we have to install the plugin on all > > nodes, the actual memory used is multiplied by the number of nodes in > > cluster. I try to figure out one way to save the memory. Tried on non-data > > node, but it seems not working. > > > > -- > > View this message in context: > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html) > > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj\_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Alexandra](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexandra/32/1521_2.png) [@Alexandra](https://discuss.elastic.co/u/Alexandra)\ **Post date:** [June 4, 2014, 8:39am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/10 "2014-06-04T08:39:09Z")
Thanks for the awesome example. Another question from me : If I wanted to take the search example and make another one there ( for example if I want to do paginated search ), could I have access to the search response inside the doExecute method ? ---
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [June 4, 2014, 4:22pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/11 "2014-06-04T16:22:50Z")
Jörg, thanks for the plugin to help as a starting point for plugin development. Although I have built a few plugins during the years, they were river or analysis plugins, which are fairly easy. Writing a custom action required a lot more digging, especially since there are very few to learn from. I still would like to see a write-up regarding the different families of transport actions: BroadcastOperationRequest, MasterNodeOperationRequest, NodesOperationRequest, SingleShardOperationRequest, SingleCustomOperationRequest, etc. What is the difference? I understand it now, but it should be documented. There is little documentation about the internals and there are no code level comments. I always meant to experiment with the different action hierarchies via simple plugins and document my findings. Perhaps one day... Cheers, Ivan On Wed, Jun 4, 2014 at 1:09 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<[joergprante@gmail.com](mailto:joergprante@gmail.com) > wrote: > Sorry, the plugin is outdated, a better start is by looking at > > [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/index-modules-similarity.html) > > Jörg > > On Wed, Jun 4, 2014 at 10:07 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > > > You need resources on all nodes that hold shards, you can not do it with > > just one instance, because ES index is distributed. Rescoring would be very > > expensive if you did it on an extra central instance with an extra > > scatter/gather phase. It is also very expensive in scripting. > > > > A better method is a similarity plugin like > > [GitHub - tlrx/elasticsearch-custom-similarity-provider: A custom SimilarityProvider example for Elasticsearch](https://github.com/tlrx/elasticsearch-custom-similarity-provider) > > > > Not sure how your code looks like though, maybe you can share it with the > > community? > > > > Jörg > > > > On Wed, Jun 4, 2014 at 2:55 AM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > > > > > The problem is that only one copy of HashMap is needed to customize > > > score of > > > all documents in the cluster. But as we have to install the plugin on all > > > nodes, the actual memory used is multiplied by the number of nodes in > > > cluster. I try to figure out one way to save the memory. Tried on > > > non-data > > > node, but it seems not working. > > > > > > -- > > > View this message in context: > > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html) > > > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "elasticsearch" group. > > > To unsubscribe from this group and stop receiving emails from it, send > > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > > To view this discussion on the web visit > > > [https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com) > > > . > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj\_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj\_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 4, 2014, 6:15pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/12 "2014-06-04T18:15:23Z")
Yeah, but I would consider the nondata node is already doing the job. -- "These "non data" nodes are still part of the cluster, and they redirect operations exactly to the node that holds the relevant data. The other benefit is the fact that for scatter / gather based operations (such as search), these nodes will take part of the processing since they will start the scatter process, and perform the actual gather processing." I just uploaded my native script code in [https://github.com/virgil0/TestPlugin](https://github.com/virgil0/TestPlugin). It works with the function score query. You can see that there are 3 bin file I need to load into memory. Thank you for reply. ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 4, 2014, 8:45pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/13 "2014-06-04T20:45:25Z")
Absolutely, agreed. The docs are sparse in my simple plugin too. I try to find some time to add sample code for all the variants and explain the differences. Jörg On Wed, Jun 4, 2014 at 6:22 PM, Ivan Brusic [ivan@brusic.com](mailto:ivan@brusic.com) wrote: > Jörg, thanks for the plugin to help as a starting point for plugin > development. > > Although I have built a few plugins during the years, they were river or > analysis plugins, which are fairly easy. Writing a custom action required a > lot more digging, especially since there are very few to learn from. I > still would like to see a write-up regarding the different families of > transport actions: BroadcastOperationRequest, MasterNodeOperationRequest, NodesOperationRequest, SingleShardOperationRequest, SingleCustomOperationRequest, > etc. What is the difference? I understand it now, but it should be > documented. There is little documentation about the internals and there are > no code level comments. I always meant to experiment with the different > action hierarchies via simple plugins and document my findings. Perhaps one > day... > > Cheers, > > Ivan > > On Wed, Jun 4, 2014 at 1:09 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > > > Sorry, the plugin is outdated, a better start is by looking at > > > > [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/index-modules-similarity.html) > > > > Jörg > > > > On Wed, Jun 4, 2014 at 10:07 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< > > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > > > > > You need resources on all nodes that hold shards, you can not do it with > > > just one instance, because ES index is distributed. Rescoring would be very > > > expensive if you did it on an extra central instance with an extra > > > scatter/gather phase. It is also very expensive in scripting. > > > > > > A better method is a similarity plugin like > > > [GitHub - tlrx/elasticsearch-custom-similarity-provider: A custom SimilarityProvider example for Elasticsearch](https://github.com/tlrx/elasticsearch-custom-similarity-provider) > > > > > > Not sure how your code looks like though, maybe you can share it with > > > the community? > > > > > > Jörg > > > > > > On Wed, Jun 4, 2014 at 2:55 AM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > > > > > > > The problem is that only one copy of HashMap is needed to customize > > > > score of > > > > all documents in the cluster. But as we have to install the plugin on > > > > all > > > > nodes, the actual memory used is multiplied by the number of nodes in > > > > cluster. I try to figure out one way to save the memory. Tried on > > > > non-data > > > > node, but it seems not working. > > > > > > > > -- > > > > View this message in context: > > > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057015.html) > > > > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > > > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "elasticsearch" group. > > > > To unsubscribe from this group and stop receiving emails from it, send > > > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > > > To view this discussion on the web visit > > > > [https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401843345821-4057015.post%40n3.nabble.com) > > > > . > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj\_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com) > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj\_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoHZTAZrAdtQAnvj_7UtO%3DaAVtN3qt337PTzDjnbCmtPaA%40mail.gmail.com?utm_medium=email&utm_source=footer) > > . > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCkOVMuEV67ZMCX5qoAdiob%2BfWsuWK%3D0EyAKf3VGhjYdQ%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGRDpkJcvWzYp1TH19j%3DWhe5XULn7eRDiPTXMPa1HR1NQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGRDpkJcvWzYp1TH19j%3DWhe5XULn7eRDiPTXMPa1HR1NQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Itamar\_Syn\_Hershko](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/itamar_syn_hershko/32/725_2.png) [@Itamar\_Syn\_Hershko](https://discuss.elastic.co/u/Itamar_Syn_Hershko)\ **Post date:** [June 4, 2014, 9:30pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/14 "2014-06-04T21:30:31Z")
You should have released this before my talk last week, I could have mentioned it :\ [![](https://us1.discourse-cdn.com/elastic/original/3X/8/9/89fecad55a0bcddf63a9915f66179f42f14eeee9.jpeg "Berlin Buzzwords 2014: Itamar Syn-Hershko - The Ultimate Guide for ElasticSearch Plugins #bbuzz") ](https://www.youtube.com/watch?v=FbAO2k57bdg) -- Itamar Syn-Hershko [http://code972.com](http://code972.com) | @synhershko [https://twitter.com/synhershko](https://twitter.com/synhershko) Freelance Developer & Consultant Author of RavenDB in Action [http://manning.com/synhershko/](http://manning.com/synhershko/) On Tue, Jun 3, 2014 at 6:15 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \<[joergprante@gmail.com](mailto:joergprante@gmail.com) > wrote: > Hi, > > many of us want to start writing extensions for Elasticsearch. > > Except submitting pull requests to the core code, one great advantage of > Elasticsearch is the plugin mechanism. Here, custom code can be hooked into > Elasticsearch, without having to ask for inclusion into the core code. > Nevertheless, plugin code can be published on Github and easily included > into a running ES instance by using the ES plugin command line tool. > > Unfortunately, writing plugins is not so easy as it seems. There are many > plugins, some of them are very advanced, and finding a starting point for a > personal project could be quite hard. > > Hence, for educational purposes, I wrote a tiny plugin, as a starting > point, to demonstrate how a plugin works. > > The simple plugin is indeed very simple. It makes reuse of the standard > search action: > > - it defines a built-in query (a "match all" query) > > - it creates a custom action for it > > - the action is called from Java API > > - the result of the action (the search response of the "match all" query) > is logged > > The plugin code comes with a junit test. It is available at > > [GitHub - jprante/elasticsearch-simple-action-plugin: A simple action plugin for Elasticsearch](https://github.com/jprante/elasticsearch-simple-action-plugin) > > In the hope it is useful, > > Jörg > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk\_7qs1J5wu1W5a8w%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk_7qs1J5wu1W5a8w%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [June 4, 2014, 9:35pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/15 "2014-06-04T21:35:45Z")
Don't forget your slides. 🙂 [http://code972.com/blog/2014/05/72-the-ultimate-guide-for-elasticsearch-plugins-video-slides](http://code972.com/blog/2014/05/72-the-ultimate-guide-for-elasticsearch-plugins-video-slides) On Wed, Jun 4, 2014 at 2:30 PM, Itamar Syn-Hershko [itamar@code972.com](mailto:itamar@code972.com) wrote: > You should have released this before my talk last week, I could have > mentioned it :\ > > [https://www.youtube.com/watch?v=FbAO2k57bdg](https://www.youtube.com/watch?v=FbAO2k57bdg) > > -- > > Itamar Syn-Hershko > [http://code972.com](http://code972.com) | @synhershko [https://twitter.com/synhershko](https://twitter.com/synhershko) > Freelance Developer & Consultant > Author of RavenDB in Action [http://manning.com/synhershko/](http://manning.com/synhershko/) > > On Tue, Jun 3, 2014 at 6:15 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > > > Hi, > > > > many of us want to start writing extensions for Elasticsearch. > > > > Except submitting pull requests to the core code, one great advantage of > > Elasticsearch is the plugin mechanism. Here, custom code can be hooked into > > Elasticsearch, without having to ask for inclusion into the core code. > > Nevertheless, plugin code can be published on Github and easily included > > into a running ES instance by using the ES plugin command line tool. > > > > Unfortunately, writing plugins is not so easy as it seems. There are many > > plugins, some of them are very advanced, and finding a starting point for a > > personal project could be quite hard. > > > > Hence, for educational purposes, I wrote a tiny plugin, as a starting > > point, to demonstrate how a plugin works. > > > > The simple plugin is indeed very simple. It makes reuse of the standard > > search action: > > > > - it defines a built-in query (a "match all" query) > > > > - it creates a custom action for it > > > > - the action is called from Java API > > > > - the result of the action (the search response of the "match all" query) > > is logged > > > > The plugin code comes with a junit test. It is available at > > > > [GitHub - jprante/elasticsearch-simple-action-plugin: A simple action plugin for Elasticsearch](https://github.com/jprante/elasticsearch-simple-action-plugin) > > > > In the hope it is useful, > > > > Jörg > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com) > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com?utm_medium=email&utm_source=footer) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk\_7qs1J5wu1W5a8w%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk_7qs1J5wu1W5a8w%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk\_7qs1J5wu1W5a8w%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk_7qs1J5wu1W5a8w%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQD0Pvbr0eenPiVYm032ZycyTGWKxL7MH3KNL5EBAJZCzg%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQD0Pvbr0eenPiVYm032ZycyTGWKxL7MH3KNL5EBAJZCzg%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 4, 2014, 10:05pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/16 "2014-06-04T22:05:57Z")
As said, it is true that scoring scripts (like the function score scripts o the AbstractSearchScript) need to reside on data nodes. Accessing fields is a low level operation in a script so it is not possible to install such a boost plugin that uses scripting on a data-less node. You would have to install it on all the data nodes which might become tedious (but it is doable). Another issue is that you use scripting in a java plugin. I conclude from this, the search should work later over the HTTP API by executing a standard function score query with the boost script name (is that true?) Writing a plugin, in a pure java environment, you have much more degrees of freedom to supersede the script functionality and use other code paths. For example, you could reuse the resource watch service from ES (used for watching script file changes) to reload the boost info (which is in your binary files I assume). Then you could build the query internally using the Java API as a custom score query action and execute it from your favorite (data-less) node (or from two nodes, for better fault tolerance / load balancing). Optionally, you could expose a new endpoint to the ES REST API, for example "\_search\_with\_boost", which works like "\_search", but makes use of the boost info files. For a more generic solution, it would be convenient to convert the boost info into a JSON parameter file so this could be loaded by the standard ES settings/config routines and by other languages, also for better reuse by others in the ES community 🙂 An example plugin name could be "boost control plugin"... Jörg On Wed, Jun 4, 2014 at 8:15 PM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > Yeah, but I would consider the nondata node is already doing the job. -- > "These "non data" nodes are still part of the cluster, and they redirect > operations exactly to the node that holds the relevant data. The other > benefit is the fact that for scatter / gather based operations (such as > search), these nodes will take part of the processing since they will start > the scatter process, and perform the actual gather processing." I just > uploaded my native script code in [GitHub - virgil0/TestPlugin](https://github.com/virgil0/TestPlugin). > It > works with the function score query. You can see that there are 3 bin file > I > need to load into memory. Thank you for reply. > > -- > View this message in context: > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO\_iKJtiGC6zrhmxJqxA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO_iKJtiGC6zrhmxJqxA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 4, 2014, 10:36pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/17 "2014-06-04T22:36:45Z")
Great walkthrough 🙂 ... I only miss the mentioning of the standard language plugins for scripting (groovy, js, etc.) And rivers are not obsolete, the "pull" method from a singleton "river" node is just discouraged. Jörg On Wed, Jun 4, 2014 at 11:30 PM, Itamar Syn-Hershko [itamar@code972.com](mailto:itamar@code972.com) wrote: > You should have released this before my talk last week, I could have > mentioned it :\ > > [https://www.youtube.com/watch?v=FbAO2k57bdg](https://www.youtube.com/watch?v=FbAO2k57bdg) > > -- > > Itamar Syn-Hershko > [http://code972.com](http://code972.com) | @synhershko [https://twitter.com/synhershko](https://twitter.com/synhershko) > Freelance Developer & Consultant > Author of RavenDB in Action [http://manning.com/synhershko/](http://manning.com/synhershko/) > > On Tue, Jun 3, 2014 at 6:15 PM, [joergprante@gmail.com](mailto:joergprante@gmail.com) \< > [joergprante@gmail.com](mailto:joergprante@gmail.com)\> wrote: > > > Hi, > > > > many of us want to start writing extensions for Elasticsearch. > > > > Except submitting pull requests to the core code, one great advantage of > > Elasticsearch is the plugin mechanism. Here, custom code can be hooked into > > Elasticsearch, without having to ask for inclusion into the core code. > > Nevertheless, plugin code can be published on Github and easily included > > into a running ES instance by using the ES plugin command line tool. > > > > Unfortunately, writing plugins is not so easy as it seems. There are many > > plugins, some of them are very advanced, and finding a starting point for a > > personal project could be quite hard. > > > > Hence, for educational purposes, I wrote a tiny plugin, as a starting > > point, to demonstrate how a plugin works. > > > > The simple plugin is indeed very simple. It makes reuse of the standard > > search action: > > > > - it defines a built-in query (a "match all" query) > > > > - it creates a custom action for it > > > > - the action is called from Java API > > > > - the result of the action (the search response of the "match all" query) > > is logged > > > > The plugin code comes with a junit test. It is available at > > > > [GitHub - jprante/elasticsearch-simple-action-plugin: A simple action plugin for Elasticsearch](https://github.com/jprante/elasticsearch-simple-action-plugin) > > > > In the hope it is useful, > > > > Jörg > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com) > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD\_bq%2BBHtRYLhw%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH-M6%2BZroAz8Reb3e2agW0vXKSavk%3D0hD_bq%2BBHtRYLhw%40mail.gmail.com?utm_medium=email&utm_source=footer) > > . > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk\_7qs1J5wu1W5a8w%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk_7qs1J5wu1W5a8w%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk\_7qs1J5wu1W5a8w%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zt-16RTbRh376Kxg%3Di7DmjRhav-PYk_7qs1J5wu1W5a8w%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. 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**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 5, 2014, 12:17am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/18 "2014-06-05T00:17:07Z")
Really good suggestion! Yeah, the search will work by executing a standard function score query with the boost script name. Thank you! 2014-06-04 15:06 GMT-07:00 [joergprante@gmail.com](mailto:joergprante@gmail.com) [via Elasticsearch Users] \< [ml-node+s115913n4057071h55@n3.nabble.com](mailto:ml-node+s115913n4057071h55@n3.nabble.com)\>: > As said, it is true that scoring scripts (like the function score scripts > o the AbstractSearchScript) need to reside on data nodes. Accessing fields > is a low level operation in a script so it is not possible to install such > a boost plugin that uses scripting on a data-less node. You would have to > install it on all the data nodes which might become tedious (but it is > doable). > > Another issue is that you use scripting in a java plugin. I conclude from > this, the search should work later over the HTTP API by executing a > standard function score query with the boost script name (is that true?) > > Writing a plugin, in a pure java environment, you have much more degrees > of freedom to supersede the script functionality and use other code paths. > For example, you could reuse the resource watch service from ES (used for > watching script file changes) to reload the boost info (which is in your > binary files I assume). Then you could build the query internally using the > Java API as a custom score query action and execute it from your favorite > (data-less) node (or from two nodes, for better fault tolerance / load > balancing). > > Optionally, you could expose a new endpoint to the ES REST API, for > example "\_search\_with\_boost", which works like "\_search", but makes use of > the boost info files. > > For a more generic solution, it would be convenient to convert the boost > info into a JSON parameter file so this could be loaded by the standard ES > settings/config routines and by other languages, also for better reuse by > others in the ES community 🙂 An example plugin name could be "boost > control plugin"... > > Jörg > > On Wed, Jun 4, 2014 at 8:15 PM, virgil \<[hidden email] > [http://user/SendEmail.jtp?type=node&node=4057071&i=0](http://user/SendEmail.jtp?type=node&node=4057071&i=0)\> wrote: > > > Yeah, but I would consider the nondata node is already doing the job. -- > > "These "non data" nodes are still part of the cluster, and they redirect > > operations exactly to the node that holds the relevant data. The other > > benefit is the fact that for scatter / gather based operations (such as > > search), these nodes will take part of the processing since they will > > start > > the scatter process, and perform the actual gather processing." I just > > uploaded my native script code in [GitHub - virgil0/TestPlugin](https://github.com/virgil0/TestPlugin). > > It > > works with the function score query. You can see that there are 3 bin > > file I > > need to load into memory. Thank you for reply. > > > > -- > > View this message in context: > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html) > > > > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [hidden email] > > [http://user/SendEmail.jtp?type=node&node=4057071&i=1](http://user/SendEmail.jtp?type=node&node=4057071&i=1). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com) > > . > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [hidden email] > [http://user/SendEmail.jtp?type=node&node=4057071&i=2](http://user/SendEmail.jtp?type=node&node=4057071&i=2). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO\_iKJtiGC6zrhmxJqxA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO_iKJtiGC6zrhmxJqxA%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO\_iKJtiGC6zrhmxJqxA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO_iKJtiGC6zrhmxJqxA%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > * * * > > If you reply to this email, your message will be added to the discussion > below: > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057071.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057071.html) > To unsubscribe from [ANN] Elasticsearch Simple Action Plugin, click here > [http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe\_by\_code&node=4056971&code=dmlyZ2lseGllQGdtYWlsLmNvbXw0MDU2OTcxfC0xNjE2Mzk5OA==](http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4056971&code=dmlyZ2lseGllQGdtYWlsLmNvbXw0MDU2OTcxfC0xNjE2Mzk5OA==) > . > NAML > [http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=macro\_viewer&id=instant\_html!nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify\_subscribers!nabble%3Aemail.naml-instant\_emails!nabble%3Aemail.naml-send\_instant\_email!nabble%3Aemail.naml](http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml) -- Fei (Virgil) Xie M.S. in Very Large Information System, Institue for Software Research School of Computer Science, Carnegie Mellon University fxie@andrew.cmu.edu Alumni, Tsinghua University ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [June 5, 2014, 8:58am UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/19 "2014-06-05T08:58:08Z")
One more hint, you see org.elasticsearch.common.lucene.search.function.FieldValueFunction This implements the ScoreFunction and fetches boost values from a configured field in the doc, for use by the Java API for FunctionScoreQuery. If you can write a custom ScoreFunction, you could implement another ScoreFunction how to obtain the boost value, in dependency of other fields in the doc. From a map with the product price info you could pass customer name or product codes. In the custom action, at each query execution, the map would have to be passed from the executing data-less node to the nodes with the shards. Caution: the map should be not too big (a few hundred entries maybe). This could be an overhead otherwise. The alternative would be simpler, a script with groovy JsonSlurper code for example, executing the boost function score search, of course on all the data nodes. This may be preferable since the search is really faster when the product price boost info is set up once from the local file system of the data node (or once a day). Jörg On Thu, Jun 5, 2014 at 2:17 AM, virgil [virgilxie@gmail.com](mailto:virgilxie@gmail.com) wrote: > Really good suggestion! Yeah, the search will work by executing a > standard function score query with the boost script name. Thank you! > > 2014-06-04 15:06 GMT-07:00 [hidden email] > [http://user/SendEmail.jtp?type=node&node=4057083&i=0](http://user/SendEmail.jtp?type=node&node=4057083&i=0) [via Elasticsearch > Users] \<[hidden email] > [http://user/SendEmail.jtp?type=node&node=4057083&i=1](http://user/SendEmail.jtp?type=node&node=4057083&i=1)\>: > > > As said, it is true that scoring scripts (like the function score scripts > > o the AbstractSearchScript) need to reside on data nodes. Accessing fields > > is a low level operation in a script so it is not possible to install such > > a boost plugin that uses scripting on a data-less node. You would have to > > install it on all the data nodes which might become tedious (but it is > > doable). > > > > Another issue is that you use scripting in a java plugin. I conclude from > > this, the search should work later over the HTTP API by executing a > > standard function score query with the boost script name (is that true?) > > > > Writing a plugin, in a pure java environment, you have much more degrees > > of freedom to supersede the script functionality and use other code paths. > > For example, you could reuse the resource watch service from ES (used for > > watching script file changes) to reload the boost info (which is in your > > binary files I assume). Then you could build the query internally using the > > Java API as a custom score query action and execute it from your favorite > > (data-less) node (or from two nodes, for better fault tolerance / load > > balancing). > > > > Optionally, you could expose a new endpoint to the ES REST API, for > > example "\_search\_with\_boost", which works like "\_search", but makes use of > > the boost info files. > > > > For a more generic solution, it would be convenient to convert the boost > > info into a JSON parameter file so this could be loaded by the standard ES > > settings/config routines and by other languages, also for better reuse by > > others in the ES community 🙂 An example plugin name could be "boost > > control plugin"... > > > > Jörg > > > > On Wed, Jun 4, 2014 at 8:15 PM, virgil \<[hidden email] > > [http://user/SendEmail.jtp?type=node&node=4057071&i=0](http://user/SendEmail.jtp?type=node&node=4057071&i=0)\> wrote: > > > > > Yeah, but I would consider the nondata node is already doing the job. -- > > > "These "non data" nodes are still part of the cluster, and they redirect > > > operations exactly to the node that holds the relevant data. The other > > > benefit is the fact that for scatter / gather based operations (such as > > > search), these nodes will take part of the processing since they will > > > start > > > the scatter process, and perform the actual gather processing." I just > > > uploaded my native script code in [GitHub - virgil0/TestPlugin](https://github.com/virgil0/TestPlugin). > > > It > > > works with the function score query. You can see that there are 3 bin > > > file I > > > need to load into memory. Thank you for reply. > > > > > > -- > > > View this message in context: > > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057054.html) > > > > > > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "elasticsearch" group. > > > To unsubscribe from this group and stop receiving emails from it, send > > > an email to [hidden email] > > > [http://user/SendEmail.jtp?type=node&node=4057071&i=1](http://user/SendEmail.jtp?type=node&node=4057071&i=1). > > > To view this discussion on the web visit > > > [https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com](https://groups.google.com/d/msgid/elasticsearch/1401905723480-4057054.post%40n3.nabble.com) > > > . > > > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [hidden email] > > [http://user/SendEmail.jtp?type=node&node=4057071&i=2](http://user/SendEmail.jtp?type=node&node=4057071&i=2). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO\_iKJtiGC6zrhmxJqxA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO_iKJtiGC6zrhmxJqxA%40mail.gmail.com) > > [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO\_iKJtiGC6zrhmxJqxA%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGBMEEc6oC1%3DBX7gS41se13BExO_iKJtiGC6zrhmxJqxA%40mail.gmail.com?utm_medium=email&utm_source=footer) > > . > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > > > * * * > > > > If you reply to this email, your message will be added to the > > discussion below: > > > > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057071.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057071.html) > > To unsubscribe from [ANN] Elasticsearch Simple Action Plugin, click here > > . > > NAML > > [http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=macro\_viewer&id=instant\_html!nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify\_subscribers!nabble%3Aemail.naml-instant\_emails!nabble%3Aemail.naml-send\_instant\_email!nabble%3Aemail.naml](http://elasticsearch-users.115913.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml) > > -- > > Fei (Virgil) Xie > > M.S. in Very Large Information System, Institue for Software Research > > School of Computer Science, Carnegie Mellon University > > [hidden email] [http://user/SendEmail.jtp?type=node&node=4057083&i=2](http://user/SendEmail.jtp?type=node&node=4057083&i=2) > > Alumni, Tsinghua University > > * * * > > View this message in context: Re: [ANN] Elasticsearch Simple Action Plugin > [http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057083.html](http://elasticsearch-users.115913.n3.nabble.com/ANN-Elasticsearch-Simple-Action-Plugin-tp4056971p4057083.html) > > Sent from the Elasticsearch Users mailing list archive > [http://elasticsearch-users.115913.n3.nabble.com/](http://elasticsearch-users.115913.n3.nabble.com/) at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > 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**Author:** ![virgil](https://avatars.discourse-cdn.com/v4/letter/v/4af34b/32.png) [@virgil](https://discuss.elastic.co/u/virgil)\ **Post date:** [June 6, 2014, 4:33pm UTC](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889/20 "2014-06-06T16:33:00Z")
Good idea! One thing I am not quite clear is that writing a custom ScoreFunction, I will have to modify elasticsearch source code and compile it right? Or there is any other way to do it? Thank you. [Next page](https://discuss.elastic.co/t/ann-elasticsearch-simple-action-plugin/17889.md?page=2)