# Extension Point for Custom Lucene Collectors? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 24, 2012, 11:54am UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501 "2012-07-24T11:54:41Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![davrob](https://avatars.discourse-cdn.com/v4/letter/d/d78d45/32.png) [@davrob](https://discuss.elastic.co/u/davrob)\ **Post date:** [July 24, 2012, 11:54am UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501/1 "2012-07-24T11:54:41Z")
Hi, I would like to use a custom org.apache.lucene.search.TopFieldCollector in my searches. Does ES have an extension point where I can do this? - David. ---
**Author:** ![Ferhat\_Celik](https://avatars.discourse-cdn.com/v4/letter/f/ee7513/32.png) [@Ferhat\_Celik](https://discuss.elastic.co/u/Ferhat_Celik)\ **Post date:** [July 30, 2012, 8:22am UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501/2 "2012-07-30T08:22:38Z")
I also got this problem. I've already have an implemented custom collector for lucene, but i don't know how to use in Elasticsearch... On Tuesday, July 24, 2012 2:54:41 PM UTC+3, davrob2 wrote: > Hi, > > I would like to use a custom org.apache.lucene.search.TopFieldCollector in > my searches. Does ES have an extension point where I can do this? > > - David. ---
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [July 30, 2012, 4:26pm UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501/3 "2012-07-30T16:26:15Z")
You can register the custom collector as a plugin. However, the collector is simply not plug-n-play, it needs to conform with the distributed nature of Elasticsearch and implement the appropriate classes. Here is a previous discussion: [http://elasticsearch-users.115913.n3.nabble.com/Creating-new-facet-types-td3745543.html](http://elasticsearch-users.115913.n3.nabble.com/Creating-new-facet-types-td3745543.html) -- Ivan On Mon, Jul 30, 2012 at 1:22 AM, Ferhat Celik [ceferhat@gmail.com](mailto:ceferhat@gmail.com) wrote: > I also got this problem. I've already have an implemented custom collector > for lucene, but i don't know how to use in Elasticsearch... > > On Tuesday, July 24, 2012 2:54:41 PM UTC+3, davrob2 wrote: > > > Hi, > > > > I would like to use a custom org.apache.lucene.search.TopFieldCollector in > > my searches. Does ES have an extension point where I can do this? > > > > - David. ---
**Author:** ![davrob](https://avatars.discourse-cdn.com/v4/letter/d/d78d45/32.png) [@davrob](https://discuss.elastic.co/u/davrob)\ **Post date:** [August 6, 2012, 10:28am UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501/4 "2012-08-06T10:28:46Z")
Hi Ivan, Thanks for the advice. I want to create a custom sort plugin that will allow custom sorting by comparator, rather than by score, which will require some map-reduce style work to gather the sort results from each shard and then combine the results into a final sort order. This is quite worrying stuff, as there is a lot that could go wrong, any clues and pointers you can give would be valuable. So far, this custom facet seems like the best example I could use, as facets also have to use map-reduce to collect their data: [https://github.com/jprante/elasticsearch-index-termlist/blob/master/src/main/java/org/elasticsearch/action/termlist/TransportTermlistAction.java](https://github.com/jprante/elasticsearch-index-termlist/blob/master/src/main/java/org/elasticsearch/action/termlist/TransportTermlistAction.java) Any other links would be welcome. - David. On Monday, July 30, 2012 5:26:15 PM UTC+1, Ivan Brusic wrote: > You can register the custom collector as a plugin. However, the > collector is simply not plug-n-play, it needs to conform with the > distributed nature of Elasticsearch and implement the appropriate > classes. > > Here is a previous discussion: > > [http://elasticsearch-users.115913.n3.nabble.com/Creating-new-facet-types-td3745543.html](http://elasticsearch-users.115913.n3.nabble.com/Creating-new-facet-types-td3745543.html) > > -- > Ivan > > On Mon, Jul 30, 2012 at 1:22 AM, Ferhat Celik [ceferhat@gmail.com](mailto:ceferhat@gmail.com) wrote: > > > I also got this problem. I've already have an implemented custom > > collector > > for lucene, but i don't know how to use in Elasticsearch... > > > > On Tuesday, July 24, 2012 2:54:41 PM UTC+3, davrob2 wrote: > > > > > Hi, > > > > > > I would like to use a custom org.apache.lucene.search.TopFieldCollector > > > in > > > my searches. Does ES have an extension point where I can do this? > > > > > > - David. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:17am UTC](https://discuss.elastic.co/t/extension-point-for-custom-lucene-collectors/8501/5 "2017-07-06T03:17:39Z")