Elastic - sharing experience in upgrading a cluster

Hi everybody,

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.



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