# I have installed Elasticsearch 7.17.17 version. i am doing semantic search, but at final search it give me the error which is give below:BadRequestError(400, 'illegal\_argument\_exception', 'Invalid type: expecting \[\_doc\] but got \[\_knn\_search\]') **URL:** \ **Category:** Elasticsearch\ **Created:** [January 26, 2024, 6:25am UTC](https://discuss.elastic.co/t/i-have-installed-elasticsearch-7-17-17-version-i-am-doing-semantic-search-but-at-final-search-it-give-me-the-error-which-is-give-below-badrequesterror-400-illegal-argument-exception-invalid-type-expecting-doc-but-got-knn-search/351853 "2024-01-26T06:25:27Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Muhammad\_Adnan1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/muhammad_adnan1/32/123579_2.png) [@Muhammad\_Adnan1](https://discuss.elastic.co/u/Muhammad_Adnan1)\ **Post date:** [January 26, 2024, 6:25am UTC](https://discuss.elastic.co/t/i-have-installed-elasticsearch-7-17-17-version-i-am-doing-semantic-search-but-at-final-search-it-give-me-the-error-which-is-give-below-badrequesterror-400-illegal-argument-exception-invalid-type-expecting-doc-but-got-knn-search/351853/1 "2024-01-26T06:25:27Z")
BadRequestError(400, 'illegal\_argument\_exception', 'Invalid type: expecting [\_doc] but got [\_knn\_search]') ---
**Author:** ![Muhammad\_Adnan1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/muhammad_adnan1/32/123579_2.png) [@Muhammad\_Adnan1](https://discuss.elastic.co/u/Muhammad_Adnan1)\ **Post date:** [January 26, 2024, 6:32am UTC](https://discuss.elastic.co/t/i-have-installed-elasticsearch-7-17-17-version-i-am-doing-semantic-search-but-at-final-search-it-give-me-the-error-which-is-give-below-badrequesterror-400-illegal-argument-exception-invalid-type-expecting-doc-but-got-knn-search/351853/2 "2024-01-26T06:32:35Z")
input\_keyword = "Blue Shoes" vector\_of\_input\_keyword = model.encode(input\_keyword) query = { "field" : "DescriptionVector", "query\_vector" : vector\_of\_input\_keyword, "k" : 2, "num\_candidates" : 500, } res = es.knn\_search(index="all\_products", knn=query , source=["ProductName","Description"]) es.k res["hits"]["hits"] this is my final query ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [January 26, 2024, 6:46am UTC](https://discuss.elastic.co/t/i-have-installed-elasticsearch-7-17-17-version-i-am-doing-semantic-search-but-at-final-search-it-give-me-the-error-which-is-give-below-badrequesterror-400-illegal-argument-exception-invalid-type-expecting-doc-but-got-knn-search/351853/3 "2024-01-26T06:46:07Z")
When looking at the docs it is important to make sure you are looking at the right version. As far as I can see the [\_knn\_search](https://www.elastic.co/guide/en/elasticsearch/reference/8.12/knn-search-api.html) API does not exist for Elasticsearch 7.17. As this is an area where a lot of development and changes are taking place I would recommend you upgrade to the latest 8.x version in order to ensure you do not develop a solution based on a changing or deprecating API. Which client and version are you using? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 23, 2024, 6:47am UTC](https://discuss.elastic.co/t/i-have-installed-elasticsearch-7-17-17-version-i-am-doing-semantic-search-but-at-final-search-it-give-me-the-error-which-is-give-below-badrequesterror-400-illegal-argument-exception-invalid-type-expecting-doc-but-got-knn-search/351853/4 "2024-02-23T06:47:04Z")
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