I have a running Cluster on Centos 7 with the RPM of Elasticsearch 5.6.13 installed and running. Now after all pre-flight checks, I want to upgrade to 6.5.
But I do not find a way to upgrade to the OSS Version of Elasticsearch without losing the data. The OSS RPM is not marked as a possible upgrade for the 5.6.13 RPM of elasticsearch. I would need to remove the old RPM but that what would wipe the data directory.
I run a test upgrade with the non-OSS RPM and even that runs into issues (did not save the mess to check on that).
But what is the proposed upgrade way from 5.6 to 6.5 without losing data or do a completely fresh installation - or re-index work. I had read the upgrade notes and it looks like it would be an easy walk if the data is prepared.
Thank you for helping me out of this situation!