[ISSUE #10103] Improve batch polling efficiency in pollIndexRecord method

[yx9o]

Fixes #10103 .

[codecov-commenter]

Codecov Report

❌ Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.85%. Comparing base (34648ed) to head (2c430e9).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ocketmq/store/index/rocksdb/IndexRocksDBStore.java	10.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10104      +/-   ##
=============================================
- Coverage      48.90%   48.85%   -0.05%     
+ Complexity     13376    13361      -15     
=============================================
  Files           1373     1373              
  Lines          99922    99924       +2     
  Branches       12908    12908              
=============================================
- Hits           48865    48820      -45     
- Misses         45126    45166      +40     
- Partials        5931     5938       +7     

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