[ISSUE #3825] Do some code optimization.[TopicMetadata]

[tooo-bad]

Fixes #3825

Motivation

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Explain why you want to make the changes and what problem you're trying to solve.

Modifications

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Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[codecov]

Codecov Report

Merging #4526 (bfe095d) into master (2bfc1ae) will not change coverage.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head bfe095d differs from pull request most recent head efa0503. Consider uploading reports for the commit efa0503 to get more accurate results

@@            Coverage Diff            @@
##             master    #4526   +/-   ##
=========================================
  Coverage     16.09%   16.09%           
  Complexity     1550     1550           
=========================================
  Files           730      730           
  Lines         28640    28640           
  Branches       2523     2523           
=========================================
  Hits           4611     4611           
  Misses        23581    23581           
  Partials        448      448           

Files	Coverage Δ
...storage/standalone/broker/model/TopicMetadata.java	58.33% <ø> (ø)

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[pandaapo]

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