[Enhancement]: Flush fails and retries, but logs at error level, which may cause confusion

[huanghaoyuanhhy]

What would you like to be added?

Adjust the log level to warn or info when flush fails but will be retried. Only log at error level if all retries have failed.

Why is this needed?

Currently, when flush fails, the system retries the operation, but the log level is set to error. This may mislead users into thinking that the flush operation has completely failed, rather than the system automatically retrying, making issue troubleshooting more difficult.

Anything else?

No response

[huanghaoyuanhhy]

/assign