[Docs] Embedded node client should disable HTTP

[pickypg]

The Java API documentation talks about the creation of an embedded node client, but it does not talk about the negatives. One oft-surprising negative is that, because it's a full node, it also provides an HTTP port for access.

For embedded client nodes, this should be disabled by default. For standalone client nodes (the main use case for client nodes), this should be on by default.

Node node =
    nodeBuilder()
        .settings(ImmutableSettings.settingsBuilder().put("http.enabled", false))
        .client(true)
    .node();

Client client = node.client();

[dadoonet]

@pickypg you wrote almost everything ! Why not sending a PR ?

Wanna do it ?

[pickypg]

Closed by 8efa18e (master), 2461e91 (1.7), d4b7e12 (1.6)