Elastic has recently announced that we are [opening x-pack][] code, which was
previously private. It will be released under a commercial license and
included in some distributions of Logstash, making certain distributions not
fully-FOSS-compliant. For that reason, we want to avoid making overly-broad
statements about "open-source" that could become confusing in the near future.
Elastic continues to invest heavily in the Apache2-licensed open core of
Logstash; we will continue to release and distribute OSS-only artifacts, and
will empower our community to use and extend Logstash.
[opening x-pack]: https://www.elastic.co/blog/doubling-down-on-openFixes#9241
