[RFS] Make indexSuffix a parameter

[mikaylathompson]

Description

• Category : Enhancement
• Why these changes are required?
• What is the old behavior before changes and new behavior after changes?
  • Previously all indices were suffixed with _reindexed. Now, they are

Issues Resolved

https://opensearch.atlassian.net/browse/MIGRATIONS-1672

Testing

Manual testing

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.91%. Comparing base (2b853a9) to head (384401e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #596      +/-   ##
============================================
+ Coverage     75.74%   75.91%   +0.17%     
+ Complexity     1495     1491       -4     
============================================
  Files           162      162              
  Lines          6348     6348              
  Branches        572      572              
============================================
+ Hits           4808     4819      +11     
+ Misses         1160     1152       -8     
+ Partials        380      377       -3     

Flag	Coverage Δ
unittests	75.91% <ø> (+0.17%)	⬆️

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[chelma]

LGTM!