Allow setting hostname and port separately for connection as an alternative

[Im0rtality]

Current:

ongr_elasticsearch:
    connections:
        default:
            hosts:
                - { host: "127.0.0.1:9200" }
            index_name: foo

Alternative way of specifying same:

ongr_elasticsearch:
    connections:
        default:
            hosts:
                - { host: "127.0.0.1" port: "9200" }
            index_name: foo

Allows for cleaner/more consistent configs as we don't need to store concatenated parameter.