Elastic search is not open source anymore. It's not under an open source license.
I'm all for open source products (I both work on and make large use of such products), but this "just open source it, you can make a business out of it anyways!" without further constraints is IMHO misguided. Open-source business models are challenging, and that needs to be recognized.
Elasticsearch is still open source they just wanted to buck companies like Amazon from taking advantage of them, which is fine by me