What is the latest and most stable version recommended for migration, which has been on the market long enough, for a cluster with dozens of nodes?

[RainTown (Kevin Maguire)]

To get more context, there's a sort of parallel discussion in thread

Elasticsearch cluster with Docker vs Kubernetes

Question regarding the upgrade of an Elasticsearch cluster, which has over 50 nodes, to a new cluster running RedHat operating system. The question is: should we build the new cluster in a Docker environment or a Kubernetes environment? What would you recommend?