Rename fields?

[someperson]

Is there any way to rename the fields coming out of this thing? We already have logs coming out of other systems with uniform field names and we'd like to be able to modify them here to match.

[magnusbaeck]

That's something you can do in Logstash. That might actually be a better place than overloading the configuration interface of this layout class.

[IsmaelMartinez]

In case it helps, this issue shows a few different ways of dealing with file renaming.
logstash-plugins/logstash-input-beats#33

This is important as log4j-jsonevent-layout creates the timestamp field with @timestamp and that clashes with logstash and filebeats @timestamp field.