minor: changes as a follow up PR

[anandheritage]

Follow up changes of this PR : #13954

1. variable name change
2. Java doc addition

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 57.92%. Comparing base (59551e4) to head (1dac494).
Report is 1036 commits behind head on master.

Files with missing lines	Patch %	Lines
...g/apache/pinot/common/utils/helix/HelixHelper.java	50.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14000      +/-   ##
============================================
- Coverage     61.75%   57.92%   -3.83%     
- Complexity      207      219      +12     
============================================
  Files          2436     2613     +177     
  Lines        133233   143270   +10037     
  Branches      20636    21995    +1359     
============================================
+ Hits          82274    82995     +721     
- Misses        44911    53781    +8870     
- Partials       6048     6494     +446     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	57.88% <50.00%> (-3.83%)	⬇️
java-21	57.78% <50.00%> (-3.85%)	⬇️
skip-bytebuffers-false	57.91% <50.00%> (-3.84%)	⬇️
skip-bytebuffers-true	57.75% <50.00%> (+30.02%)	⬆️
temurin	57.92% <50.00%> (-3.83%)	⬇️
unittests	57.92% <50.00%> (-3.83%)	⬇️
unittests1	40.72% <50.00%> (-6.17%)	⬇️
unittests2	27.98% <0.00%> (+0.25%)	⬆️

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[Jackie-Jiang]

Thank you for addressing them