Add field from an array


(Wayne Hunter) #1

The syslog patterns parse into the message field which causes the message field to become an array.

I would like to add a new field with mutate which uses as it's value the content of message[1] although I'm getting issues. Note that message[0] contains the original message.

  mutate { # Logstash syslog patterns parse into the message field therefore move into seperate field.
    add_field => [ 'text' => "%{message}[1]"]
  }

(Magnus Bäck) #2

If you set overwrite => ["message"] for the grok filter it'll overwrite the original value instead of creating an array. If you really want to save the original field value (useful if you ever want to reindex but otherwise rather pointless) you can rename message prior to the grok filter (and then you don't need the override option).

add_field => [ 'text' => "%{message}[1]"]

You're mixing syntaxes. Pick one of:

add_field => ['text', "%{message}[1]"]
add_field => { 'text' => "%{message}[1]" }

(Wayne Hunter) #3

Thanks Magnus although I did the following:

ruby { code => "event['text'] = event['message'][1]" }


(Dan Garthwaite) #4

You meant overwrite => ["message"]


(Magnus Bäck) #5

You meant overwrite => ["message"]

Yes indeed—thanks! I've edited the original post.


(system) #6