Metricbeat 7.3 windows module sevice metricset filter error

- module: windows
  metricsets: ["service"]
  period: 60s
  processors:
  - drop_event.when.not.equals:
      windows.service.display_name: Windows Firewall

this example is taken straight out of the documentation.
needless to say it doesn't work.
The error from the log is:
Could not apply the configuration, error:[1 error: Error creating runner from config: each processor must have exactly one action, but found 2 actions (drop_event, windows)]

How can I fix this?