query_field_names bugfix

[petardz]

Description

Fixed query_field_names being accumulated when loading per-packgaged rules

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov-commenter]

Codecov Report

Merging #335 (1313efd) into main (78ea8be) will decrease coverage by 0.11%.
The diff coverage is 11.11%.

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@@             Coverage Diff              @@
##               main     #335      +/-   ##
============================================
- Coverage     36.96%   36.86%   -0.11%     
+ Complexity      887      886       -1     
============================================
  Files           179      179              
  Lines          7010     7032      +22     
  Branches        855      857       +2     
============================================
+ Hits           2591     2592       +1     
- Misses         4182     4202      +20     
- Partials        237      238       +1     

Impacted Files	Coverage Δ
...securityanalytics/mapper/IndexTemplateManager.java	0.00% <0.00%> (ø)
...search/securityanalytics/mapper/MapperService.java	4.61% <0.00%> (+0.06%)	⬆️
...ch/securityanalytics/mapper/MappingsTraverser.java	82.35% <ø> (ø)
.../securityanalytics/rules/backend/QueryBackend.java	64.34% <0.00%> (-1.14%)	⬇️
...opensearch/securityanalytics/util/RuleIndices.java	0.00% <0.00%> (ø)
...rityanalytics/util/SecurityAnalyticsException.java	36.66% <33.33%> (ø)
...rch/securityanalytics/rules/objects/SigmaRule.java	91.20% <100.00%> (+0.19%)	⬆️
...g/opensearch/securityanalytics/model/Detector.java	70.24% <0.00%> (-0.35%)	⬇️

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