# ES replica creation

**URL:** https://discuss.elastic.co/t/es-replica-creation/340872
**Category:** Elasticsearch
**Created:** [August 16, 2023, 6:33am UTC](https://discuss.elastic.co/t/es-replica-creation/340872 "2023-08-16T06:33:43Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![khubaibathar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/khubaibathar/32/124647_2.png) [@khubaibathar](https://discuss.elastic.co/u/khubaibathar)
#### Post date: [August 16, 2023, 6:33am UTC](https://discuss.elastic.co/t/es-replica-creation/340872/1 "2023-08-16T06:33:43Z")

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Hi,  
Can someone tell me if ES is able to create a replica while still in use. Would it affect the performance of the cluster or does this mechanism run in the background.  
We have an ES cluster which has six nodes.

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### Author: ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)
#### Post date: [August 16, 2023, 7:07am UTC](https://discuss.elastic.co/t/es-replica-creation/340872/2 "2023-08-16T07:07:00Z")

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It runs in the background.

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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: [September 13, 2023, 7:07am UTC](https://discuss.elastic.co/t/es-replica-creation/340872/3 "2023-09-13T07:07:52Z")

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