Hello, I have encountered the problem mentioned above.
I encountered it during the rolling upgrade of elasticsearch 6.8.1 to 7.8.1.
Because my 6.8.1 did not configure xpack related configuration, but I want to configure this function in 7.8.1.
My approach is this:
- On the basis that the cluster is 6.8.1, first offline a datanode node
- Upgrade this node to 7.8.1, and configure xpack in elasticsearch.yml, and then start it
- But it is found that it cannot join the current cluster, and the error reported in the log is consistent with your example 1.
So I want to ask how to solve it?
Our cluster does not want to stop the service, so it must be upgraded on a rolling basis
Thank you very much。
I saw this issue mentioned in 2019, so I would like to ask if it has been resolved now?