User.name field for event ID 4104

I found a solution:

I added the following to the winlogbeat.yml processors section for the ForwardedEvents log.

    - copy_fields:
        when.equals.winlog.channel: Microsoft-Windows-PowerShell/Operational
        fields:
          - from: winlog.user.name
            to: user.name 
        fail_on_error: false
        ignore_missing: true
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