Filebeat missing all logs from K8s cluster

We have deployed filebeat in kubernetes cluster to collect large volume of logs. However we see filebeat is not indexing all the logs. It is consistently missing good amount of logs. We did setup monitoring for beats agents to see what's really going on. Monitoring dashboards looks clean whatever events read by filebeat being ingested to Elasticsearch. Just wanted to know if there are any known bugs regarding filebeat reading kubernetes logs.