See you are deploying on a Kubernetes cluster 
You could try to add an index filed to the output like this index: "filebeat-%{[agent.version]}-%{+yyyy.MM.dd}", see the documentation here: https://www.elastic.co/guide/en/beats/filebeat/current/elasticsearch-output.html. Depending on your use case, you should also consider if you want a new index created every day. The recommended index size is around 50GB