# Curator: Forcemerging

**URL:** <https://discuss.elastic.co/t/curator-forcemerging/134014>\
**Category:** Elasticsearch\
**Created:** [May 31, 2018, 10:04am UTC](https://discuss.elastic.co/t/curator-forcemerging/134014 "2018-05-31T10:04:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dawiro](https://avatars.discourse-cdn.com/v4/letter/d/71e660/32.png) [@dawiro](https://discuss.elastic.co/u/dawiro)\
**Post date:** [May 31, 2018, 10:04am UTC](https://discuss.elastic.co/t/curator-forcemerging/134014/1 "2018-05-31T10:04:20Z")

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Hi,  
After upgrading, we have a lot of indices that need optimizing. if i run a forcemerge via curator on indices older than a day will it forcemerge all indices in parallel or in sequence?

Regards,  
D

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**Author:** ![theuntergeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/theuntergeek/32/44961_2.png) [@theuntergeek](https://discuss.elastic.co/u/theuntergeek)\
**Post date:** [May 31, 2018, 3:16pm UTC](https://discuss.elastic.co/t/curator-forcemerging/134014/2 "2018-05-31T15:16:05Z")

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In sequence. Elasticsearch itself will not allow concurrent forcemerge operations.

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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:** [June 28, 2018, 3:16pm UTC](https://discuss.elastic.co/t/curator-forcemerging/134014/3 "2018-06-28T15:16:17Z")

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