Exception when iterating through the ledgers to check for over-replication

[xuesongxs]

Describe the bug

Pulsar v2.8.1
Exceptions thrown when pulsar cluster is running.

[github-actions]

The issue had no activity for 30 days, mark with Stale label.

[tisonkun]

Closing as stale. If it's still relevant to maintained versions, feel free to open a new issue.