Is there a possibility to add a custom field with a static value in a metricset? The thing that I'm interested in is adding a custom field for the cpu metricset and only to that (not for other metricsets from the system module). I know that I can add a custom field in the metricbeat configuration file, but that way I'm getting that field in all documents from metricbeat. I'm using version 6.0.
My system.yml is configured with default settings.