[Backport 2.x] Add DerivedFieldMapper and support parsing it in mappings (#12569)

[rishabhmaurya]

Adds a DerivedFieldMapper to support the Derived Fields feature enhancement as well as updating the mapper parsing logic to recognize and currently parse derived fields in the mappings.

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Signed-off-by: Mohammad Qureshi [email protected]
Signed-off-by: Rishabh Maurya [email protected]
Co-authored-by: Rishabh Maurya [email protected]
(cherry picked from commit 8ca3e6a)

Description

This is the backport 2.x PR for #12569

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[github-actions]

Compatibility status:

Checks if related components are compatible with change 694e186

Incompatible components

Skipped components

Compatible components

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

[github-actions]

❌ Gradle check result for 03669a7: FAILURE

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[github-actions]

❌ Gradle check result for 6106a56: FAILURE

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[github-actions]

❌ Gradle check result for 6106a56: FAILURE

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[github-actions]

❌ Gradle check result for 0bb945b: FAILURE

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[github-actions]

❌ Gradle check result for 0bb945b: FAILURE

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[github-actions]

❌ Gradle check result for 0bb945b: FAILURE

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[github-actions]

✅ Gradle check result for 694e186: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 80.89888% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 71.15%. Comparing base (0dd892c) to head (694e186).
Report is 115 commits behind head on 2.x.

Files	Patch %	Lines
...java/org/opensearch/index/mapper/ObjectMapper.java	71.15%	9 Missing and 6 partials ⚠️
...rg/opensearch/index/mapper/DerivedFieldMapper.java	93.93%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #13036      +/-   ##
============================================
- Coverage     71.28%   71.15%   -0.13%     
- Complexity    60145    60483     +338     
============================================
  Files          4957     4996      +39     
  Lines        282799   284908    +2109     
  Branches      41409    41632     +223     
============================================
+ Hits         201591   202731    +1140     
- Misses        64189    65036     +847     
- Partials      17019    17141     +122     

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