# Upgrade cluster from 6.8 to 7.x

**URL:** <https://discuss.elastic.co/t/upgrade-cluster-from-6-8-to-7-x/208167>\
**Category:** Elasticsearch\
**Tags:** ilm-index-lifecycle-management\
**Created:** [November 16, 2019, 1:57pm UTC](https://discuss.elastic.co/t/upgrade-cluster-from-6-8-to-7-x/208167 "2019-11-16T13:57:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lazyusername](https://avatars.discourse-cdn.com/v4/letter/l/278dde/32.png) [@lazyusername](https://discuss.elastic.co/u/lazyusername)\
**Post date:** [November 16, 2019, 1:57pm UTC](https://discuss.elastic.co/t/upgrade-cluster-from-6-8-to-7-x/208167/1 "2019-11-16T13:57:27Z")

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Hello,

I am about to upgrade some clusters from 6.8.4 to 7.3.2 (7.4.2 soon) and I am not sure if I should reindex all of my indices in these clusters.

In [documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.4/reindex-upgrade.html) I see a lot of mentions about the indices should be readable. But when I have indices created in 6.8.x will I be able to write to them in 7.3.x?

It's really hard to me to find out more info about indices versions compatiblity - I mean more than indices from 5.x should be reindexed if i want to upgrade to 7.x cluster.

Thx for sharing any related info with me.

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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:** [December 14, 2019, 1:57pm UTC](https://discuss.elastic.co/t/upgrade-cluster-from-6-8-to-7-x/208167/2 "2019-12-14T13:57:30Z")

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