# Can replicas serve kNN search requests?

**URL:** <https://discuss.elastic.co/t/can-replicas-serve-knn-search-requests/321059>\
**Category:** Elasticsearch\
**Tags:** vector-search\
**Created:** [December 12, 2022, 4:57pm UTC](https://discuss.elastic.co/t/can-replicas-serve-knn-search-requests/321059 "2022-12-12T16:57:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![robertdebug](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/robertdebug/32/114432_2.png) [@robertdebug](https://discuss.elastic.co/u/robertdebug)\
**Post date:** [December 12, 2022, 4:57pm UTC](https://discuss.elastic.co/t/can-replicas-serve-knn-search-requests/321059/1 "2022-12-12T16:57:30Z")

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Hello,  
I have a question about kNN search and index replicas. According to the [documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/scalability.html), replicas can increase capacity to serve read requests like searching or retrieving a document.  
Does this also applies for approximate kNN search?

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**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:** [December 12, 2022, 5:37pm UTC](https://discuss.elastic.co/t/can-replicas-serve-knn-search-requests/321059/2 "2022-12-12T17:37:32Z")

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Yep! It sure does!

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 9, 2023, 5:38pm UTC](https://discuss.elastic.co/t/can-replicas-serve-knn-search-requests/321059/3 "2023-01-09T17:38:06Z")

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