High CPU (cgroup) usage/utilization

Ok, so we have about 5 "clients" (filebeat and metricbeat) that are sending data to Elastic cloud. I've turned off all of those clients so no new data was coming to the cloud for the last 4 days. And for whatever reason, I've lost all data but for the last 2 days, even though there was no activity on the node for the last 4 days (wasn't restarted etc...):

Not only that, something is still causing 50% CPU usage for whatever reason:

... even though really not much is happening on the instance:

... and the instance config hasn't changed for the last 13 days:

Any kind of help or insight would be much appreciated.