# Unable to change the size of the bulk thread pool

**URL:** <https://discuss.elastic.co/t/unable-to-change-the-size-of-the-bulk-thread-pool/47431>\
**Category:** Elasticsearch\
**Created:** [April 14, 2016, 7:33pm UTC](https://discuss.elastic.co/t/unable-to-change-the-size-of-the-bulk-thread-pool/47431 "2016-04-14T19:33:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![CraigWh](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@CraigWh](https://discuss.elastic.co/u/CraigWh)\
**Post date:** [April 14, 2016, 7:33pm UTC](https://discuss.elastic.co/t/unable-to-change-the-size-of-the-bulk-thread-pool/47431/1 "2016-04-14T19:33:31Z")

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I am running ElasticSearch 2.3 and indexing large numbers of documents using the Bulk API. I wanted to tweak the size of the bulk thread pool to see how that effects performance, but it appears ES locks the max to be 1 thread per core, even though the docs do not mention this as being the case.

Am I able to increase the size of the Bulk thread pool?

Thanks,  
Craig

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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:** [July 5, 2017, 10:59pm UTC](https://discuss.elastic.co/t/unable-to-change-the-size-of-the-bulk-thread-pool/47431/2 "2017-07-05T22:59:05Z")

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