Added unit test to elasticsearchhelper

[HarelM]

This is an initial attempt to add unit tests to elastic helper.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.50%. Comparing base (31a8a1c) to head (6c5b3f2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #26      +/-   ##
============================================
+ Coverage     97.16%   98.50%   +1.33%     
- Complexity      198      202       +4     
============================================
  Files             8        8              
  Lines           600      600              
  Branches        102      104       +2     
============================================
+ Hits            583      591       +8     
+ Misses            9        4       -5     
+ Partials          8        5       -3     

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