static void validateFilter(AclBindingFilter filter) {
        if (filter.patternFilter().isUnknown()) {
            throw new InvalidRequestException("Unknown patternFilter.");
        }
        if (filter.entryFilter().isUnknown()) {
            throw new InvalidRequestException("Unknown entryFilter.");
        }
    }
The AclControlManager manages any ACLs that are stored in the __cluster_metadata topic.
If the ACLs are stored externally (such as in ZooKeeper) then there will be nothing for
this manager to do.
metadata/src/main/java/org/apache/kafka/controller/AclControlManager.java