org.apache.iotdb.rpc.IoTDBConnectionException: Error occurs when closing session at server,Maybe server is down

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

v12.0

### Describe the bug and provide the minimal reproduce step


### What did you expect to see?

现在某电力系统锅炉项目遇到iotdb使用cpu负载过高的问题，导致系统页面出现访问卡顿现象、iotdb连接超时等问题。

### What did you see instead?

进行了调整超时时间（6s调到1分钟），连接数（5调整到100），发现还是无法解决。运行一段时间还是出现连接超时问题。

### Anything else?

希望大佬们给予支持，我的邮箱是jurfliu@163.com

### Are you willing to submit a PR?

- [X] I'm willing to submit a PR!

Start with the v12.0 reproduction details and attached screenshots, focusing on the server-side close error, CPU load, and connection timeouts. Reproduce the problem with the reported timeout and connection-count changes, then document a minimal case and determine whether the exception is caused by server shutdown or overload.

Written by the indexing model from the issue text.