Elixir also opens you up to the entire erlang and Beam ecosystems. Not as common as Java, I know, but still decades of knowledge and tooling around it cutting across many industries.
This said it’s the only environment I’m aware of that is built around the idea of cluster, not just a local process that may do some rpc to other processes.
You can find libraries for many things but they are not the same quality and breadth as the big Java ones.