# Filter vector search by similarity value

**URL:** <https://discuss.elastic.co/t/filter-vector-search-by-similarity-value/339654>\
**Category:** Elasticsearch\
**Tags:** vector-search\
**Created:** [July 31, 2023, 7:23am UTC](https://discuss.elastic.co/t/filter-vector-search-by-similarity-value/339654 "2023-07-31T07:23:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![john\_nicolas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/john_nicolas/32/123249_2.png) [@john\_nicolas](https://discuss.elastic.co/u/john_nicolas)\
**Post date:** [July 31, 2023, 7:23am UTC](https://discuss.elastic.co/t/filter-vector-search-by-similarity-value/339654/1 "2023-07-31T07:23:16Z")

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i used in mappings file a dense\_vector for knn

```auto
   "esvector": {
        "type": "dense_vector",
        "dims": 768,
        "index": true,
        "similarity": "cosine"
      },

```

I want to use a similarity threshold , but it does'nt work for me , i dont find the way of using this threshold

```auto
payload['query'] =my_complex_queries
        payload['knn'] ={
                    "field": "esvector",
                    "query_vector": vector_field,
                    "candidates":100,
                    "k":5,
                    "similarity":0.5
                  }

```

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<div class="post-metadata">

**Author:** ![BenTrent](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bentrent/32/33915_2.png) [@BenTrent](https://discuss.elastic.co/u/BenTrent)\
**Post date:** [July 31, 2023, 11:53am UTC](https://discuss.elastic.co/t/filter-vector-search-by-similarity-value/339654/2 "2023-07-31T11:53:40Z")

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@john_nicolas ,

> , but it does'nt work for me ,

Could you clarify? Do you receive an error?

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<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:** [August 28, 2023, 11:54am UTC](https://discuss.elastic.co/t/filter-vector-search-by-similarity-value/339654/3 "2023-08-28T11:54:21Z")

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