[Backport 2.x] Fix parsing of flat object fields with dots in keys

[msfroh]

We have a bug where a flat object field with inner fields that contain dots will "push" the dotted name onto the dot-path from the root, but then would just "pop" off the last part of the dotted name.

This change adds more robust support for flat object keys and subkeys that contain dots (i.e. it pops off the entirety of the latest key, regardless of how many dots it contains).

Fixes #11402
Backport of #11425

Signed-off-by: Michael Froh froh@amazon.com
(cherry picked from commit 22b628b)

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 9316f6d

Incompatible components

Skipped components

Compatible components

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

[github-actions]

❌ Gradle check result for b43ce24: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 9316f6d:

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 9316f6d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteIndexPrimaryRelocationIT.testPrimaryRelocationWhileIndexing
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (334636f) 71.12% compared to head (9316f6d) 71.04%.
Report is 4 commits behind head on 2.x.

Files	Patch %	Lines
...ch/common/xcontent/JsonToStringXContentParser.java	81.25%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11825      +/-   ##
============================================
- Coverage     71.12%   71.04%   -0.08%     
+ Complexity    59351    59300      -51     
============================================
  Files          4889     4889              
  Lines        279804   279814      +10     
  Branches      41028    41031       +3     
============================================
- Hits         199004   198793     -211     
- Misses        63941    64170     +229     
+ Partials      16859    16851       -8     

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