# Elastic 5 \> 7: Decrease Storage Usage?

**URL:** <https://discuss.elastic.co/t/elastic-5-7-decrease-storage-usage/260594>\
**Category:** Elasticsearch\
**Created:** [January 9, 2021, 6:07am UTC](https://discuss.elastic.co/t/elastic-5-7-decrease-storage-usage/260594 "2021-01-09T06:07:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![myspacebarisbroken](https://avatars.discourse-cdn.com/v4/letter/m/e9a140/32.png) [@myspacebarisbroken](https://discuss.elastic.co/u/myspacebarisbroken)\
**Post date:** [January 9, 2021, 6:07am UTC](https://discuss.elastic.co/t/elastic-5-7-decrease-storage-usage/260594/1 "2021-01-09T06:07:47Z")

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Hi!

I'm upgrading my ES cluster from V 5 to V7, I've noticed that space usage has significantly been reduced, is that normal?

my V5 cluster: 10B Documents, ~2.2 TB

V7 Cluster: 10B Documents, ~1.5 TB

(Same exact documents, a little tweaking to mappings since some settings were removed/added, no sorting was done)

Where can i read more into why/how this is happening?

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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:** [January 11, 2021, 12:15am UTC](https://discuss.elastic.co/t/elastic-5-7-decrease-storage-usage/260594/2 "2021-01-11T00:15:54Z")

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There's been quite a large number of efficiency improvements between those versions. I am not sure there's a single place to look at as a result.

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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:** [February 8, 2021, 12:15am UTC](https://discuss.elastic.co/t/elastic-5-7-decrease-storage-usage/260594/3 "2021-02-08T00:15:54Z")

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