I am new in Elasticsearch.
And I would like to get some feedback from experienced users/admins about the best way upgrading a cluster.
I manage 2 small clusters 3 nodes each.
First cluster in version 6.8 manages about 200 indices, the second one in version 6.6 gets 150 indices.
Small and simple config too (Elastic + Logstash + Kibana).
Servers are running RHEL 7.6 (Maipo) and openjdk version "1.8.0_212".
My question is very simple:
which method would you recommend ? Full upgrade or rolling upgrade ?
I plan to upgrade the first one from 6.8 to 7.1.1.
And the second one from 6.6 to 6.8 and then from 6.8 to 7.1.1.
Thank you for sharing your experience.