# Configuring a Custom Similarity **URL:** \ **Category:** Elasticsearch\ **Created:** [April 30, 2013, 8:22pm UTC](https://discuss.elastic.co/t/configuring-a-custom-similarity/11756 "2013-04-30T20:22:07Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![phill](https://avatars.discourse-cdn.com/v4/letter/p/779978/32.png) [@phill](https://discuss.elastic.co/u/phill)\ **Post date:** [April 30, 2013, 8:22pm UTC](https://discuss.elastic.co/t/configuring-a-custom-similarity/11756/1 "2013-04-30T20:22:07Z")
I would like to port my customized Similarity class that I wrote for Lucene over to ElasticSearch. Is this possible at all before 0.90.0 Beta1? [http://www.elasticsearch.org/guide/reference/index-modules/similarity/](http://www.elasticsearch.org/guide/reference/index-modules/similarity/) Since "Index Modules" still don't have any page that explains where the example module defining documents go, can someone remind me again where the examples get used? I have script with the following command that I use to create my indices at this time. curl -XPOST "http://:9200$node/$indexName/?pretty=1" -d '{ settings: { number\_of\_shards: 2, number\_of\_replicas: 3, analysis: { analyzer: { ... } } } }, mappings: { "MyDocumentType1": { ... } } I'm assuming (without documentation to confirm) that once I'm running 0.90.0 I'd just add , "similarity: { .... } Is this correct? Can I also put the YML equivalent of this block in my elasticsearch.yml file? The similarity page shows the Json document: "similarity" : { "my\_similarity" : { "type" : "DFR", "basic\_model" : "g", "after\_effect" : "l", "normalization" : "h2", "normalization.h2.c" : "3.0" } } Can I specify a custom class using this new 0.90.0 similarity syntax? Maybe "similarity": { ``` "my_similarity": { "type": "com.myDomain.extensions.MySimilarity", "myArg1" : "foo", "myArg2" : "42" } ``` } -Paul -- 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). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![Tanguy1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tanguy1/32/1749_2.png) [@Tanguy1](https://discuss.elastic.co/u/Tanguy1)\ **Post date:** [May 2, 2013, 7:15am UTC](https://discuss.elastic.co/t/configuring-a-custom-similarity/11756/2 "2013-05-02T07:15:39Z")
Hi Paul, I made something similar last year, and I hope this may help you: > **[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 It was on a 0.20.0.Beta1-SNAPSHOT. -- Tanguy > **[tlrx - Overview](https://github.com/tlrx/)** > > tlrx has 23 repositories available. Follow their code on GitHub. Twitter: @tlrx Le mardi 30 avril 2013 22:25:16 UTC+2, P Hill a écrit : > I would like to port my customized Similarity class that I wrote for > Lucene over to Elasticsearch. > > Is this possible at all before 0.90.0 Beta1? > [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/reference/index-modules/similarity/) > > Since "Index Modules" still don't have any page that explains where the > example module defining documents go, can someone remind me again where > the examples get used? > > I have script with the following command that I use to create my indices > at this time. > > curl -XPOST "http://:9200$node/$indexName/?pretty=1" -d '{ > settings: { > number\_of\_shards: 2, > number\_of\_replicas: 3, > analysis: { > analyzer: { > ... > } > } > } > }, > mappings: { > "MyDocumentType1": { > ... > } > } > > I'm assuming (without documentation to confirm) that once I'm running > 0.90.0 I'd just add > > , "similarity: { > .... > } > > Is this correct? > > Can I also put the YML equivalent of this block in my elasticsearch.yml > file? > > The similarity page shows the Json document: > > "similarity" : { > "my\_similarity" : { > "type" : "DFR", > "basic\_model" : "g", > "after\_effect" : "l", > "normalization" : "h2", > "normalization.h2.c" : "3.0" > } > } > > Can I specify a custom class using this new 0.90.0 similarity syntax? > Maybe > > "similarity": { > > ``` > "my_similarity": { > > "type": "com.myDomain.extensions.MySimilarity", > > "myArg1" : "foo", > > "myArg2" : "42" > > } > > ``` > > } > > -Paul -- 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). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![mathursharp](https://avatars.discourse-cdn.com/v4/letter/m/58f4c7/32.png) [@mathursharp](https://discuss.elastic.co/u/mathursharp)\ **Post date:** [November 15, 2013, 6:06am UTC](https://discuss.elastic.co/t/configuring-a-custom-similarity/11756/3 "2013-11-15T06:06:07Z")
Hi, Can you please explain how to use a customsimilarity jar (created by overridding the similarity class of lucene) can be used . i am confused on how to use this with java api and during mapping. please help me out. ---
**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, 2:06am UTC](https://discuss.elastic.co/t/configuring-a-custom-similarity/11756/4 "2017-07-06T02:06:49Z")