I am just starting with Elasticsearch 6.5.1 (our current version is 5.6).
Need to use XPack for users, passwords, etc.

Question: Do I necessarily need to setup encryption between nodes? Or I can have authentication for users, encryption for user and Kibana access, but without node-to-node encryption?

I tried to start Elasticsearch without TLS, but then I could not install the XPack license, it gave me an error:

   `Cannot install a [PLATINUM] license unless TLS is configured or security is disabled`

But if i disable security, then I cannot use XPack at all.