Inflight events check cannot work with 7.17.0+

[eLvErDe]

Hello,

Logstash stats API has changed and out counter does not include anymore items discarded by a filter option so there is no more any way to known if in - out difference is lagging or discarded items.

I opened a ticket trying to explain why I think it's a bad idea, let's see if they answer: https://github.com/elastic/logstash/issues/14069

Regards,