Hey,
so you are on 6.1.3 locally according to the find call, but try to install x-pack 6.2.1 here. What does rpm -q elasticsearch return?
This is the version mismatch, that I was searching for. I didnt correctly read it for the first time.
Can you try to install x-pack 6.1.3 together with elasticsearch 6.1.3 or x-pack 6.2.1 with Elasticsearch 6.2.1 RPM?
--Alex