Tantrum is pretty accurate I think. They voiced their extreme displeasure in a war of words with Elastic. They knew that the relicensing was targeted 100% at their gravy train and they condescendingly declared that they would "step up on behalf of open source" while they stepped up exclusively to prevent Elastic getting a cut of their ElasticSearch hosting profits.
The fork is really half hearted with about 1/10th the resources Elastic dedicates to the mainline branch:
The fork is really half hearted with about 1/10th the resources Elastic dedicates to the mainline branch:
https://camo.githubusercontent.com/71f7e9147092c7d4b08df18da...
Meanwhile, the only effective licensing difference is that you can sell hosting with their fork - something that only benefits them.