Add a field to @metadata dictionary

Wondering if would be possible to add an extra field to the @metadata 'dictionary' from an input section of filebeat?

Eg. someting like:


- type: filestream
  id: <some id goes here>
  enabled: true
     dsprefix: "prefix-value_"

  index: "%{[@metadata.dsprefix]}filebeat-%{[agent.version]}"

$ filebeat test config
Exiting: error loading config file: yaml: line 30: found character that cannot start any token

complains about the line starting with '@'

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