# Optimize action run on the Elasticsearch Cluster

**URL:** <https://discuss.elastic.co/t/optimize-action-run-on-the-elasticsearch-cluster/25910>\
**Category:** Elasticsearch\
**Created:** [July 20, 2015, 1:08pm UTC](https://discuss.elastic.co/t/optimize-action-run-on-the-elasticsearch-cluster/25910 "2015-07-20T13:08:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![awislowski](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/awislowski/32/3789_2.png) [@awislowski](https://discuss.elastic.co/u/awislowski)\
**Post date:** [July 20, 2015, 1:08pm UTC](https://discuss.elastic.co/t/optimize-action-run-on-the-elasticsearch-cluster/25910/1 "2015-07-20T13:08:34Z")

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I have a question concerning optimize action.

If I run optimize on the cluster, does optimize action is run independently on the primary shards and replica shards?

Or is it run only on primary and then replicated to the replacas?

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**Author:** ![colings86](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/colings86/32/44960_2.png) [@colings86](https://discuss.elastic.co/u/colings86)\
**Post date:** [July 20, 2015, 1:37pm UTC](https://discuss.elastic.co/t/optimize-action-run-on-the-elasticsearch-cluster/25910/2 "2015-07-20T13:37:35Z")

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The optimise will be run independently on the primaries and replicas

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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 6, 2017, 12:00am UTC](https://discuss.elastic.co/t/optimize-action-run-on-the-elasticsearch-cluster/25910/3 "2017-07-06T00:00:22Z")

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