ERROR RmqSourceReplicator-SourceWatcher-1 - Fetch topic list error.

**BUG REPORT**

1. Please describe the issue you observed:

- What did you do (The steps to reproduce)?
i use rockermq-operator create thress rocker cluster A B C. User cluster A deploy RocketMQ Runtime and RocketMQ Replicator。

- What is expected to see?
i wang sync topic and message in cluster B to cluster c,
http://x.x.x.x:8082/connectors/rocketmq-replicator-name?config={"connector-class":"org.apache.rocketmq.replicator.RmqSourceReplicator","source-rocketmq":"clusterB:30032","target-rocketmq":"clusterC:30001","replicator-store-topic":"replicatorTopic","task-divide-strategy":"0","white-list":"","task-parallelism":"2","source-record-converter":"org.apache.rocketmq.connect.runtime.converter.JsonConverter","target-cluster":"target-cluster","source-cluster":"source-cluster","connect-topicname":"test-sync"}

- What did you see instead?
2022-05-17 15:58:13 INFO NettyClientSelector_1 - closeChannel: close the connection to remote address[] result: true
2022-05-17 15:58:16 ERROR RmqSourceReplicator-SourceWatcher-1 - Fetch topic list error.
java.lang.IllegalStateException: no broker found for srcTopic: TopicTest2 srcCluster: source-cluster
at org.apache.rocketmq.replicator.RmqSourceReplicator.ensureTargetTopic(RmqSourceReplicator.java:311)
at org.apache.rocketmq.replicator.RmqSourceReplicator.buildRoute(RmqSourceReplicator.java:251)
at org.apache.rocketmq.replicator.RmqSourceReplicator$1.run(RmqSourceReplicator.java:125)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)

2. Please tell us about your environment:

3. Other information (e.g. detailed explanation, logs, related issues, suggestions on how to fix, etc):

i think connect-topicname should not must be here, but if not, the request will start rocketmq-replicator failed.
what is rockermq version is support, i use 4.5.1. it need to accesse broker? i deploy rocker cluster on k8s, broker can't be accessed out k8s cluster.

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