Enhancement: elasticsearch list of servers for connection

[faxm0dem]

Use a list for server instead of a string: usually ppl have multiple nodes in cluster, and this could also autodiscover when left empty

[juhaszviktor]

I don't know how can we do the autodiscovering method.
Have you any idea? I ask it, because you know the elasticsearch better, than me.

[faxm0dem]

To add more than one server, we can simply call .addTransportAddress() multiple times.
For autodiscover, I think we need to set up a node client as opposed to transport client.
I think the former feature is more important.