Couchbase Server Pod , out of memory

I have deployed couchbase on GKE using the provided helm chart here - helm-charts/values-all.yaml at master · couchbase-partners/helm-charts · GitHub

I have enabled audit-cleanup and logging sidecar containers , but when i exec into my pod and check the memory ( df -h) I see the following directory is slowly filling up , when it is full , the pod goes into unready state , need help to resolve this issue .
/dev/sdc 2.0G 482M 1.5G 25% /opt/couchbase/etc