origin-aggregated-logging/elasticsearch: Incomplete fix for netty-codec-http CVE-2021-21409

A flaw was found in the original fix for the netty-codec-http CVE-2021-21409, where the OpenShift Logging openshift-logging/elasticsearch6-rhel8 container was incomplete. The vulnerable netty-codec-http maven package was not removed from the image content. This flaw affects origin-aggregated-logging versions 3.11.