Add note about JAVA_HOME to docs

Based on a suggestion to update the documentation: https://discuss.elastic.co/t/logstash-not-seeing-conf-files-in-conf-d-dir/75931/9

Fixes elastic#6751

Support params to specify output dir

Fixes elastic#6682

v5.2

Fix typo causing docs build failure.

Fixes elastic#6488

Updated lock file for 5.1 (elastic#6356)

Updated lock file for 5.1 (elastic#6356)

use a temporary path instead of a temporary file

Using an empty file for the regitry make FB quits with a EOF error

Fixes: elastic#6285

Fixes elastic#6286

Regenerate lock file for 5.0.1 (elastic#6239)

Release 2.4.1 (elastic#6207)

* Release 2.4.1

* Add release notes. Explicitly constraint docker and ansicolor

ES input was not removed

I accidentally added logstash-input-elasticsearch in this list because
in my RC testing I had manually removed it using bin/logstash-plugin remove

Fixes elastic#6119