# Can someone explain me what's going on in this period?

**URL:** <https://discuss.elastic.co/t/can-someone-explain-me-whats-going-on-in-this-period/132507>\
**Category:** Elasticsearch\
**Created:** [May 18, 2018, 3:21pm UTC](https://discuss.elastic.co/t/can-someone-explain-me-whats-going-on-in-this-period/132507 "2018-05-18T15:21:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![br14nb0](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/br14nb0/32/28814_2.png) [@br14nb0](https://discuss.elastic.co/u/br14nb0)\
**Post date:** [May 18, 2018, 3:21pm UTC](https://discuss.elastic.co/t/can-someone-explain-me-whats-going-on-in-this-period/132507/1 "2018-05-18T15:21:50Z")

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Look like the index size changing and I don't understand what is processing here. Can you suggest me a doc to understand here ? Thanks  
 ![image](https://us1.discourse-cdn.com/elastic/original/3X/2/3/23f0898a85db787cf31a9790ccbd94528b7f2e3c.png)

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [May 20, 2018, 9:00am UTC](https://discuss.elastic.co/t/can-someone-explain-me-whats-going-on-in-this-period/132507/2 "2018-05-20T09:00:39Z")

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It's due to merging - [https://www.elastic.co/guide/en/elasticsearch/reference/6.2/index-modules-merge.html](https://www.elastic.co/guide/en/elasticsearch/reference/6.2/index-modules-merge.html)

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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 17, 2018, 9:00am UTC](https://discuss.elastic.co/t/can-someone-explain-me-whats-going-on-in-this-period/132507/3 "2018-06-17T09:00:41Z")

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