private static FindCoordinatorResponse prepareFindCoordinatorResponse(Errors error, String key, Node node) {
        return FindCoordinatorResponse.prepareResponse(error, key, node);
    }
Test if admin client can be closed in the callback invoked when
an api call completes. If calling {@link Admin#close()} in callback, AdminClient thread hangs
clients/src/test/java/org/apache/kafka/clients/admin/KafkaAdminClientTest.java