server: fix inappropriate log level

[Jackl9u]

What problem does this PR solve?

Issue Number: Ref #8453

What is changed and how does it work?

changed log.Error to log.Warn, since it's a warning

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

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[ti-chi-bot]

Hi @Jackl9u. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[HuSharp]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.34%. Comparing base (84f90f4) to head (e05a2bf).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8462      +/-   ##
==========================================
+ Coverage   77.29%   77.34%   +0.05%     
==========================================
  Files         472      472              
  Lines       61796    61796              
==========================================
+ Hits        47764    47797      +33     
+ Misses      10461    10431      -30     
+ Partials     3571     3568       -3     

Flag	Coverage Δ
unittests	77.34% <100.00%> (+0.05%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HuSharp, JmPotato, okJiang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-31 07:50:05.865542695 +0000 UTC m=+342122.145590764: ☑️ agreed by JmPotato.
• 2024-07-31 08:03:41.820771819 +0000 UTC m=+342938.100819888: ☑️ agreed by HuSharp.