@Override
            UnregisterBrokerRequest.Builder createRequest(int timeoutMs) {
                UnregisterBrokerRequestData data =
                        new UnregisterBrokerRequestData().setBrokerId(brokerId);
                return new UnregisterBrokerRequest.Builder(data);
            }
Returns the broker id pertaining to the given resource, or null if the resource is not associated
with a particular broker.
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java