# What is search thread\_pool?

**URL:** <https://discuss.elastic.co/t/what-is-search-thread-pool/149800>\
**Category:** Elasticsearch\
**Created:** [September 25, 2018, 10:27am UTC](https://discuss.elastic.co/t/what-is-search-thread-pool/149800 "2018-09-25T10:27:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hamid\_bayat](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hamid_bayat/32/74056_2.png) [@hamid\_bayat](https://discuss.elastic.co/u/hamid_bayat)\
**Post date:** [September 25, 2018, 10:27am UTC](https://discuss.elastic.co/t/what-is-search-thread-pool/149800/1 "2018-09-25T10:27:05Z")

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hi  
I have some question about thread\_pool.  
on \_cat/thread\_pool , when there is some "search thread\_pool rejected" on a node, what exactly missing in the search? some shards? or some doc? or fetch phase? or request?  
where is thread\_pool's queue memory? on HEAP?  
is there any retry for rejected search?

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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:** [October 23, 2018, 10:27am UTC](https://discuss.elastic.co/t/what-is-search-thread-pool/149800/2 "2018-10-23T10:27:20Z")

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