Hello,

related to #14617 I found no way to check the parameters used by a module

Eg
-M netflow.var.log.expiration_timeout=3600m -M netflow.var.log.queue_size=64000 -M netflow.var.custom_definitions=filepath

If I write a wrong value, for example a wrong file path or read_buffer=aaaa there is no message at all

Worst if there is a false parameters like netflow.log.xx.read_buffer there is no issue at all

Maybe I missed something but I guess a starting log message or a command to shows the value used by filebeat (configured by parameters) could be very useful