Fix the problem of LockObtainFailedException while performing a rolling update

[JohnNiang]

What type of PR is this?

/kind bug
/area core
/milestone 2.19.0

What this PR does / why we need it:

This PR refactors LuceneSearchEngine to let IndexWriter and SearcherManager load lazily to prevent LockObtainFailedException from performing a rolling update.

Which issue(s) this PR fixes:

Fixes #6541

Special notes for your reviewer:

1. Use MySQL or PostgreSQL as database for Halo
2. Start an instance of Halo
3. Try to initialize Halo and search posts
4. Change the server.port and start another instance of Halo
5. Check the status of another instance

Does this PR introduce a user-facing change?

修复滚动更新时无法启动新的 Halo 实例的问题

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 83.87097% with 10 lines in your changes missing coverage. Please review.

Project coverage is 57.77%. Comparing base (6cd8dc8) to head (74b7bb2).
Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
...run/halo/app/search/lucene/LuceneSearchEngine.java	83.87%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6543      +/-   ##
============================================
- Coverage     58.18%   57.77%   -0.41%     
- Complexity     3774     3876     +102     
============================================
  Files           651      669      +18     
  Lines         22125    22917     +792     
  Branches       1538     1594      +56     
============================================
+ Hits          12873    13241     +368     
- Misses         8641     9053     +412     
- Partials        611      623      +12     

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[guqing]

/approve

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing, ruibaby

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