OK, so I started an attempt to upgrade my elasticsearch node. I had one node with 5.6.3 version and a few indices. I added another node with version 6.8.12. I Reindexed all my indices and added a prefix 6-8 so that new indices names are some-index-6.8 thought this process the nodes have crashed …

Rolling upgrade - can't revert... :-(

system (system) Closed October 19, 2020, 6:29am 4

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Topic		Replies	Views
Rollback ES upgrade Elasticsearch	3	1569	July 6, 2017
Upgrade Rollback Elasticsearch	2	4142	March 10, 2020
Reverting to previous version for just one node in the cluster Elasticsearch	6	888	January 9, 2018
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Rolling upgrade - can't revert... :-(

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