[phd514]

Core authentication and security features in Elasticsearch have been free and not Enterprise features since last May: https://www.elastic.co/blog/security-for-elasticsearch-is-no...

[_msw_]

Disclosure: I work for AWS

Free for some to use under certain restrictions. Therefore not Open Source (which is totally OK, I just want to make sure there's no confusion).

[nrmitchi]

Sweet, I didn't know that had changed. Good decision.