Hello,
I read the instructions about upgrading cluster:
https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html
I have still few questions:
Lets say that I have 2 hosts and on every host I installed 3 elasticsearch nodes (Every node have own elasticsearch.yml and init scirpt).
How should properly look like upgrade of the cluster?
Should I:
1.) Stop shard allocation
2.) Stop 3 nodes of elastic on that host
3.) Upgrade elasticsearch
4.) Start service es1, es2, es3
5.) Wait for status green of cluster.
After that should I do the same with second host?