I'm testing out some configurations with Filebeat and one thing which I am struggling to accomplish is having Filebeat add some form of indication to the event if it has been handled by multiline.
The events are being sent to a Logstash layer within which I would like to test whether or not the event is a multline. if the event is a multiline we'd like to just send the event 'as is', but if not we would like to further enrich the event before sending to ES.
Having a simple way to test whether or not the event is a multiline by testing for the existence of a basic field or value seems like the simplest way to do this. If we cannot inject a field or tag to test on are there any other techniques that could be used?