ECS for Metricbeat to use "Kibana -> Metrics"

I'm trying to filter my data into ECS properly, right now I'm trying to write CPU stats like perecentage.

So my question is:
Which fields are required for Kibana -> Metrics > CPU Usage?

I'm using metricbeat's index pattern.
Right now I have "" and "" but sadly "Kibana -> Metrics ->CPU Usage" is showing 0% for all my hosts. It actually did read host.names properly and I see all my hosts on the list but not CPU usage percentages, it seems I'm missing some field.