Merge branch 'stable-2.16'
* stable-2.16:
Design documentation
Remove empty unused file
Healthcheck: remove from the configuration
AutoReindex: remove from the configuration
Fix eclipse warning about missing serialVersionUID
Remove obsolete configuration parameters
Delete rest forwarder and autoreindexer modules
ForwardedEventHandler: open request context when dispatching
Ensure proper context during deserialization
CacheEvictionEventRouter: Fix unneeded cast warning in eclipse
Allow configuration of kafka specific props
Flogger: rely on native cause formatting
Fix serialization of comment events
Change-Id: I7008a75bd1c98426f3c4d144e401482588ca0b9e
