@Override
        public String toString() {
            return "CreateTopicPolicy.RequestMetadata(topic=" + topic +
                    ", numPartitions=" + numPartitions +
                    ", replicationFactor=" + replicationFactor +
                    ", replicasAssignments=" + replicasAssignments +
                    ", configs=" + configs + ")";
        }
Return topic configs in the request, not including broker defaults. Broker configs are passed via
the {@code configure()} method of the policy implementation.
clients/src/main/java/org/apache/kafka/server/policy/CreateTopicPolicy.java