# NEST API Setting default similarity to "classic" not BM25 programatically . how?

**URL:** <https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522>\
**Category:** Elasticsearch\
**Created:** [November 6, 2017, 12:23pm UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522 "2017-11-06T12:23:31Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![kenneth\_Canet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kenneth_canet/32/23081_2.png) [@kenneth\_Canet](https://discuss.elastic.co/u/kenneth_Canet)\
**Post date:** [November 6, 2017, 12:23pm UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522/1 "2017-11-06T12:23:31Z")

</div>

Hello,

I was able to do this using query dsl.

```
post my_index/_close

put my_index/_settings
{
  "settings": {
    "index": {
      "similarity": {
        "default": {
          "type": "classic"
        }
      }
    }
  }
}

post my_index/_open
```

But i'm having problem converting this to Nest. If you could give me a link related to this/or if you did the same, your inputs will be greatly appreciated.

Thank you!

---

<div class="post-metadata">

**Author:** ![kenneth\_Canet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kenneth_canet/32/23081_2.png) [@kenneth\_Canet](https://discuss.elastic.co/u/kenneth_Canet)\
**Post date:** [November 6, 2017, 12:57pm UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522/2 "2017-11-06T12:57:41Z")

</div>

Our goal is to use the classic similarity for all the indices. I solved my problem using template.

```
PUT /_template/template_1?pretty
{

  "template": "*",

  "settings": {
    "index": {
      "similarity": {
        "default": {
          "type": "classic"
        }
      }
    }
  },

  "mappings": {

  }

}
```

[https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-templates.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-templates.html)

---

<div class="post-metadata">

**Author:** ![forloop](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/forloop/32/9021_2.png) [@forloop](https://discuss.elastic.co/u/forloop)\
**Post date:** [November 8, 2017, 8:41am UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522/3 "2017-11-08T08:41:39Z")

</div>

Setting Classic similarity in NEST is missing; [I've opened an issue to addess.](https://github.com/elastic/elasticsearch-net/issues/2890)

---

<div class="post-metadata">

**Author:** ![kenneth\_Canet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kenneth_canet/32/23081_2.png) [@kenneth\_Canet](https://discuss.elastic.co/u/kenneth_Canet)\
**Post date:** [November 8, 2017, 10:21am UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522/4 "2017-11-08T10:21:55Z")

</div>

cool, thanks!

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 6, 2017, 10:22am UTC](https://discuss.elastic.co/t/nest-api-setting-default-similarity-to-classic-not-bm25-programatically-how/106522/5 "2017-12-06T10:22:02Z")

</div>

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