Not sure, but I think they are taking about the recent licensing changes of the elasticsearch server [0] and restricting elasticsearch clients to only be compatible with elasticsearch, not any forks [1]

[0]: https://www.elastic.co/pricing/faq/licensing [1]: https://news.ycombinator.com/item?id=28110610

pretty aweful, this: https://thenewstack.io/this-week-in-programming-the-elastics...