# Slow force merge after 7.5.0 -\> 7.9.1 upgrade

**URL:** https://discuss.elastic.co/t/slow-force-merge-after-7-5-0-7-9-1-upgrade/252311
**Category:** Elasticsearch
**Created:** [October 16, 2020, 7:30am UTC](https://discuss.elastic.co/t/slow-force-merge-after-7-5-0-7-9-1-upgrade/252311 "2020-10-16T07:30:29Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Dmitry1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dmitry1/32/50610_2.png) [@Dmitry1](https://discuss.elastic.co/u/Dmitry1)
#### Post date: [October 16, 2020, 7:30am UTC](https://discuss.elastic.co/t/slow-force-merge-after-7-5-0-7-9-1-upgrade/252311/1 "2020-10-16T07:30:29Z")

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Hello, I've upgraded elastic from 7.5.0 -\> 7.9.1 and notice, that force merge time for my daily index increased more than twice! I don't change any setting.

Script do force merge like this :

set this index parameters:

```auto
"index.merge.policy.max_merge_at_once_explicit": "40"
"index.merge.scheduler.max_thread_count" : "43"

```

```auto
curl -s -u l:p -XPOST "http://localhost:9200/$pushindex/_forcemerge?max_num_segments=10"

```

I have 2 nodes and 6 shards for each index, so in the end of force merge I have 60 segments in index.

Before upgrade ( version7.5.0):

 ![before_fast](https://us1.discourse-cdn.com/elastic/original/3X/f/9/f916327bb99ad1df82e3f7d7b0b22d658b921514.png)

After upgrade ( version 7.9.1):

 ![after_slow](https://us1.discourse-cdn.com/elastic/original/3X/3/7/37640681337c724274a64a57f864bf1c00c67d2c.png)

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 13, 2020, 7:30am UTC](https://discuss.elastic.co/t/slow-force-merge-after-7-5-0-7-9-1-upgrade/252311/2 "2020-11-13T07:30:33Z")

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