Elastic - sharing experience in upgrading a cluster

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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.

Regards,

Jean-Marc

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