feat: added missing test for elasticsearch reconciler

[Ankit152]

Which problem is this PR solving?

• Missing unit test for controllers/elasticsearch

Description of the changes

• Adds missing unit test for controllers/elasticsearch

How was this change tested?

• Tested locally make test-unit

Checklist

• [x] I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• [x] I have signed all commits
• [ ] I have added unit tests for the new functionality
• [ ] I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.47%. Comparing base (e5546c7) to head (7870cdd). Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2662      +/-   ##
==========================================
+ Coverage   75.41%   75.47%   +0.05%     
==========================================
  Files         124      124              
  Lines        8525     8525              
==========================================
+ Hits         6429     6434       +5     
+ Misses       1899     1894       -5     
  Partials      197      197              

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