Comment by pas
4 years ago
Elastic contributed to Lucene. (They have committers as PMCs.)
If Lucene had adopted SSPL they would have been forced to fork. But basically nothing really interesting happens at the Lucene level for ES anymore. (Sure, there's always a lot to speed up, optimize, etc. But anyone who buys ES needs the fancy stuff, security/audit/management, not a few percent more RAM efficiency.)
Sorry, but this is not true at all.
Some of the biggest changes within ES come from Lucene, like _massive_ reduction in memory footprint, enabling ES to use cases not even possible before.