poorbarcode opened a new pull request, #20932:
URL: https://github.com/apache/pulsar/pull/20932
### Motivation
When I did this test below and got the error "Topic not found".
```java
pulsarAdmin.topics().createNonPartitionedTopic("persistent://public/default/tp_1");
Consumer consumer = null;
Consumer consumer = pulsarClient.newConsumer()
.topic("persistent://public/default/tp_1")
.subscriptionName("s1")
.enableRetry(true)
.subscribe();
```
I do create the topic `persistent://public/default/tp_1` first but got a
response "Topic not found", it is confusing.
The root cause is the retry letter topic
`persistent://public/default/tp_1-sub1-RETRY` was not created.
### Modifications
clear the vague response if the topic is not founded.
### Documentation
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- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: x
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