Adolfo, Still could not test how sockets relate to shards and why I automatically > get 10 established sockets when opening a client: > > node = builder.client(clientOnly).data(!clientOnly).local(local).node(); > > client = node.client(); > > > on default ES configuration, and many many more sockets after (up to 200), > and how this number changes when increasing/decreasing number of shards, > > Of course, your application should create only one client and then let all threads within the application share that one client. Each client, especially the NodeClient, typically creates a thread pool behind it. It's a very heavy-weight object, so do not create more than one of them. But it's perfectly thread-safe and can (should) be used by as many threads in your application as desired.
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