Is there a way to exclude unwanted lines into one event with logstash

[syrine_chelly]

i want to delete certain lines in the messsage field using logstash .I don't want to drop the field just extra lines in the field. is it possible ?

[Badger]

Are you saying you want to keep only the first line in the message field? If so then you could try

mutate { gsub => [ "message", "\n.*", "" ] }

[syrine_chelly]

i don't want just to keep the first line.i want to delete lines into the message field and keep others.I don't find a solution to do it

[leandrojmp (Leandro Pereira)]

You need to share an example of your message and what you want to remove to see if it is possible or not and how to do it.