Combine functionality ES/OpenSearch

[bblommers]

Fixes #8420

[codecov]

Codecov Report

Attention: Patch coverage is 97.82609% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.63%. Comparing base (e9991da) to head (57ede93).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/opensearch/responses.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #8491    +/-   ##
========================================
  Coverage   92.62%   92.63%            
========================================
  Files        1225     1224     -1     
  Lines      105708   105838   +130     
========================================
+ Hits        97916    98038   +122     
- Misses       7792     7800     +8     

Flag	Coverage Δ
servertests	27.76% <34.78%> (+0.01%)	⬆️
unittests	92.60% <97.82%> (+<0.01%)	⬆️

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