# Default similarity in Elasticsearch **URL:** \ **Category:** Elasticsearch\ **Created:** [October 26, 2016, 5:11pm UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034 "2016-10-26T17:11:27Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![adriel](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adriel](https://discuss.elastic.co/u/adriel)\ **Post date:** [October 26, 2016, 5:11pm UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/1 "2016-10-26T17:11:27Z")
The docs ([https://www.elastic.co/guide/en/elasticsearch/reference/current/similarity](https://www.elastic.co/guide/en/elasticsearch/reference/current/similarity)) and announcement blog post ([https://www.elastic.co/blog/elasticsearch-5-0-0-released](https://www.elastic.co/blog/elasticsearch-5-0-0-released)) seem to disagree about the new default similarity. Is it classic or BM25? ---
**Author:** ![colings86](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/colings86/32/44960_2.png) [@colings86](https://discuss.elastic.co/u/colings86)\ **Post date:** [October 27, 2016, 7:54am UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/2 "2016-10-27T07:54:28Z")
I think you may have got a stale version of that page when you looked before. The page has moved slightly and the documentation you link to now 404s for me due to that. Take a look at the new location of the doucmentation here which agrees with the blog post that the default is BM25: [https://www.elastic.co/guide/en/elasticsearch/reference/5.0/index-modules-similarity.html#\_available\_similarities](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/index-modules-similarity.html#_available_similarities) ---
**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:** [October 27, 2016, 8:08am UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/3 "2016-10-27T08:08:17Z")
There is a glitch on [https://www.elastic.co/guide/en/elasticsearch/reference/5.0/similarity.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/similarity.html) still stating that default similarity is `classic` ---
**Author:** ![colings86](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/colings86/32/44960_2.png) [@colings86](https://discuss.elastic.co/u/colings86)\ **Post date:** [October 27, 2016, 8:10am UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/4 "2016-10-27T08:10:03Z")
Oh, well spotted @jprante, I'll raise it on the ES Repo. Thanks ---
**Author:** ![colings86](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/colings86/32/44960_2.png) [@colings86](https://discuss.elastic.co/u/colings86)\ **Post date:** [October 27, 2016, 8:15am UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/5 "2016-10-27T08:15:03Z")
I raised [https://github.com/elastic/elasticsearch/pull/21144](https://github.com/elastic/elasticsearch/pull/21144) to fix this, Thanks both for raising this ---
**Author:** ![adriel](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adriel](https://discuss.elastic.co/u/adriel)\ **Post date:** [October 27, 2016, 1:46pm UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/6 "2016-10-27T13:46:37Z")
Thanks so much @colings86 and @jprante! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 10:09pm UTC](https://discuss.elastic.co/t/default-similarity-in-elasticsearch/64034/7 "2017-07-05T22:09:05Z")