> Elasticsearch was under the Apache 2.0 license, which, contrary to FOSS-licensed (GPL and co.), allows derivatives to be under a different license. No. Copy

> Elasticsearch was under the Apache 2.0 license, which, contrary to FOSS-licensed (GPL and co.), allows derivatives to be under a different license. No. Copyright prohibits you from changing the license on copyrighted code. Do some licenses allow binary redistribution? Sure. Do Some licenses allow source redistribution? Sure. Can you include Apache 2.0 licensed code in a GPL project? Yes. But you can't change the original license for the code.