Reindexing automatically for migration from Elastic 6.8 (indices) to OpenSearch

Hey @TechSys

Another community member while back posted what to do. I followed those instructions and worked great.

Also this Documentation work very well.

https://go2docs.graylog.org/5-0/planning_your_deployment/upgrading_to_opensearch.htm

What I did was migrate everything from one CentOS7 node to another Ubuntu node and performed an upgrade from ES 7.10 to OS v1.3. My update path was a little different (1.3 → 2.0 → 2.5)

I would not go past opensearch=2.5.0, There have been some issues/bugs FYI