fix(metric): field_name not being accepted in open-search and elastic-search in freshness metric

[WeryZebra-Yue]

Fixes/Implements #90

Description

opensearch and elasticsearch in freshness metric is not accepting field_name.

Type of change

Delete irrelevant options.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Locally Tested

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (75b36e1) 84.72% compared to head (76cbbc9) 84.72%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   84.72%   84.72%           
=======================================
  Files          33       33           
  Lines        1368     1368           
=======================================
  Hits         1159     1159           
  Misses        209      209           

Files Changed	Coverage Δ
...achecks/core/configuration/configuration_parser.py	77.94% <100.00%> (ø)

... and 2 files with indirect coverage changes

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