ExecutionContext for bindService and for ServerBuilder

[waagnermann]

Hello!
In this line you pass executionContext only to GreeterGrpc.bindService but not to ServerBuilder which is possible by calling .executor(..) on ServerBuilder.forPort(HelloWorldServer.port) (source).

You did that for a reason or it was just for the sake of example? What is the best practise here: these two thread pools rather be the same or separate?