[Backport 2.x] Unmute get field mapping test

[opensearch-trigger-bot]

Backport a50d1f6 from #12422.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 55b6938

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

✅ Gradle check result for 55b6938: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e24648) 71.13% compared to head (55b6938) 71.12%.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12429      +/-   ##
============================================
- Coverage     71.13%   71.12%   -0.01%     
+ Complexity    59948    59946       -2     
============================================
  Files          4945     4945              
  Lines        282230   282230              
  Branches      41341    41341              
============================================
- Hits         200754   200730      -24     
- Misses        64470    64500      +30     
+ Partials      17006    17000       -6     

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