Fix runtime failure in RealtimeQuickStartWithMinion

[KKcorps]

The map in superclass is immutable. Hence the it fails at runtime.

[codecov-commenter]

Codecov Report

Merging #8871 (c407502) into master (e8f9d88) will decrease coverage by 0.05%.
The diff coverage is 68.10%.

❗ Current head c407502 differs from pull request most recent head 736e26d. Consider uploading reports for the commit 736e26d to get more accurate results

@@             Coverage Diff              @@
##             master    #8871      +/-   ##
============================================
- Coverage     68.56%   68.51%   -0.06%     
- Complexity     4640     4977     +337     
============================================
  Files          1741     1804      +63     
  Lines         91475    93883    +2408     
  Branches      13674    13981     +307     
============================================
+ Hits          62724    64325    +1601     
- Misses        24363    25056     +693     
- Partials       4388     4502     +114     

Flag	Coverage Δ
integration1	26.30% <1.08%> (-0.77%)	⬇️
unittests1	66.43% <72.23%> (+0.21%)	⬆️
unittests2	15.45% <61.50%> (+1.33%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...roker/requesthandler/BaseBrokerRequestHandler.java	68.45% <ø> (ø)
...roker/requesthandler/GrpcBrokerRequestHandler.java	0.00% <0.00%> (ø)
...requesthandler/MultiStageBrokerRequestHandler.java	0.00% <0.00%> (ø)
...ctionaryBasedSingleColumnDistinctOnlyExecutor.java	0.00% <0.00%> (ø)
...e/pinot/plugin/stream/kinesis/KinesisConsumer.java	33.33% <0.00%> (-1.33%)	⬇️
...segment/creator/impl/SegmentDictionaryCreator.java	91.11% <0.00%> (-1.55%)	⬇️
...gment/index/column/IntermediateIndexContainer.java	81.57% <ø> (ø)
...al/segment/index/datasource/MutableDataSource.java	87.50% <ø> (ø)
...ache/pinot/segment/local/utils/IngestionUtils.java	28.07% <0.00%> (-0.17%)	⬇️
.../pinot/server/starter/helix/BaseServerStarter.java	56.72% <0.00%> (-0.76%)	⬇️
... and 149 more

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[npawar]

duplicate of #8858