# ElasticSearch very slow after upgrade 5.6.2 to 6.6.1

**URL:** <https://discuss.elastic.co/t/elasticsearch-very-slow-after-upgrade-5-6-2-to-6-6-1/169786>\
**Category:** Elasticsearch\
**Created:** [February 25, 2019, 9:31am UTC](https://discuss.elastic.co/t/elasticsearch-very-slow-after-upgrade-5-6-2-to-6-6-1/169786 "2019-02-25T09:31:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Dredy](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@Dredy](https://discuss.elastic.co/u/Dredy)\
**Post date:** [February 25, 2019, 9:31am UTC](https://discuss.elastic.co/t/elasticsearch-very-slow-after-upgrade-5-6-2-to-6-6-1/169786/1 "2019-02-25T09:31:58Z")

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today I upgraded a single node (Windows Server 2012R2) ElasticSearch installation to 6.6.1 from 5.6.2

The node has a single Index with 133.000 docs (2Gb ElasticSearch reserved RAM)  
After upgrade I deleted and recreated the index.

Unfortunately I'm experiencing a very slow-down in all the operations

A simple "browser query" (ie: /\_search?index=search\_3&q= _tv_ %20led\*&size=50&default\_operator=AND&sort=\_score:desc) took 10x more time as before.

With 5.6.2 it tooks 39ms  
With 6.6.1 it tooks 500ms in every circumstance

What is wrong with my upgrade path?

After some test i uninstalled the 6.6.1 and reinstalled 5.6.2 and now all works as before.

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [February 25, 2019, 10:23am UTC](https://discuss.elastic.co/t/elasticsearch-very-slow-after-upgrade-5-6-2-to-6-6-1/169786/2 "2019-02-25T10:23:29Z")

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I suspect this might be due to you querying without specifying a field and the fact that the \_all field has been removed. How large are your documents? How many fields?

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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:** [March 25, 2019, 10:32am UTC](https://discuss.elastic.co/t/elasticsearch-very-slow-after-upgrade-5-6-2-to-6-6-1/169786/3 "2019-03-25T10:32:14Z")

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