Filebeats on kubernetes - How to change log level on yaml

Hello Folks!
I have a OKD Server and would like set "logging.level: warning" into filebeat-kubernetes.yaml file, since default is "info". Then deploy it ( kubectl create -f filebeat-kubernetes.yaml ).
Any idea what extra entries I could set into yaml file ?

https://www.elastic.co/guide/en/beats/filebeat/master/running-on-kubernetes.html
https://www.elastic.co/guide/en/beats/filebeat/current/configuration-logging.html

Appreciate any help!