GitHub user powertoredstar added a comment to the discussion: Why I can't
update TopicConfig by DefaultMQAdminExt?
I know how to change the message type by setting the attribute when I create a
topic now.But I still can't realize why I change the topicConfig is wrong.
```java
DefaultMQAdminExt admin = new DefaultMQAdminExt();
admin.setNamesrvAddr("10.30.18.78:19876");
admin.start();
String clusterName = "DefaultCluster";
String topicName = "AI-CHAT-TOPIC";
Map<String, String> map = new HashMap<>();
admin.deleteTopic(topicName,clusterName);
map.put("+message.type", MessageType.FIFO.name());
System.out.println(MessageType.FIFO.name());
admin.createTopic(clusterName, topicName, 1, map);
```
GitHub link:
https://github.com/apache/rocketmq/discussions/9647#discussioncomment-14252075
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