private static FeatureMetadata defaultFeatureMetadata() {
        return new FeatureMetadata(
            Utils.mkMap(Utils.mkEntry("test_feature_1", new FinalizedVersionRange((short) 2, (short) 2))),
            Optional.of(1L),
            Utils.mkMap(Utils.mkEntry("test_feature_1", new SupportedVersionRange((short) 1, (short) 5))));
    }
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