Logstash 5.0.0-alpha5 has been released yesterday with a good deal of new features. The Monitoring API has been cleaned up a bit and a few more fixes are in the pipe.
Also as announced previously, this release includes the handling of some additional fields, namely:
- 
matches,failures,patterns_per_fieldfor thegrokfilter - 
matchesandformatsfor thedatefilter 
Check out the latest release of logstashbeat at: https://github.com/consulthys/logstashbeat
The next release will include additional fields for some specific logstash input, like jdbc, tcp, redis, etc. Stay tuned...