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Elasticsearch is open source, again
(www.elastic.co)
This is a most excellent place for technology news and articles.
Enterprise licensing for self-hosted setups is priced per chunk of 64 GB of RAM in your cluster. I.e. if you run Elastic on 2 machines of 32 GB RAM each, you pay for 1 node. It sounds like there may have been some poor communication going on, because they definitely don't base the pricing for self-hosted setups on the number of employees or anything like that.
They're also not super uptight about you going over the licensing limit for a while. We've been running a couple of licenses short since we scaled our cluster up a while back. Our account manager knows and doesn't care.