public Map<Uuid, Optional<StandardAcl>> changes() {
        return changes;
    }
Returns a Map of deltas from ACL ID to optional StandardAcl. An empty optional value indicates the ACL
is for removal. An optional with a value indicates the ACL is to be added.

@return Map of deltas.
metadata/src/main/java/org/apache/kafka/image/AclsDelta.java