Clarify load balance behavior if array of hosts is used #866
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I've seen the question, how the output load balances, coming up every now and then and the docs should have the answer.
I'd still like a logstash developer to review and double check that it still is Round-robin per bulk in the current version of the plugin.
My assumption is based on #274 and #493 (comment), but the first one is from 2015 and the second onw is from 2018, but with Logstash 2.4.