CODEWITHSUNDEEP
logstash
Alex
Alex

Reputation: 892

How to pass temporary data from filter to output in logstash

How do you pass temporary data from a filter to output in logstash?

filter {    

    mutate {
         add_field => {"TEMP_DATA" => "%{some value}"}
    }      
}

output {  
   elasticsearch {
       document_id => "%{TEMPDATA}"
   }
}

The above will output the TEMPDATA value

Upvotes: 2

Views: 2655

Answers (1)

Val
Val

Reputation: 217294

The correct and standard way of achieving this is by using the @metadata field. @metadata is a special field that will never be stored in your events but whose sole purpose is to pass data among your inputs, filters and outputs.

Sample usage:

filter {
  mutate { add_field => { "[@metadata][TEMP_DATA]" => "%{some value}" } }
}

output {
  elasticsearch {
    document_id => "%{[@metadata][TEMP_DATA]}"
  }
}

Upvotes: 5

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