[Backport 2.x] Add copy ingest processor

[opensearch-trigger-bot]

Backport 6d2d4dd from #11870.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 799c648

Incompatible components

Incompatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/cross-cluster-replication.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/security.git]

[github-actions]

❕ Gradle check result for 799c648: 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
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermarkWithAutoReleaseEnabled

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: 4 lines in your changes are missing coverage. Please review.

Comparison is base (c48fb55) 71.04% compared to head (799c648) 71.01%.

Files	Patch %	Lines
...va/org/opensearch/ingest/common/CopyProcessor.java	93.61%	3 Missing ⚠️
...g/opensearch/ingest/common/IngestCommonPlugin.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11907      +/-   ##
============================================
- Coverage     71.04%   71.01%   -0.03%     
+ Complexity    59352    59308      -44     
============================================
  Files          4890     4891       +1     
  Lines        279826   279874      +48     
  Branches      41035    41042       +7     
============================================
- Hits         198799   198766      -33     
- Misses        64210    64239      +29     
- Partials      16817    16869      +52     

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