[Backport 2.x] fix for ERROR alert state generation in doc-level monitors

[opensearch-trigger-bot]

Backport daf8c7c from #768

[codecov-commenter]

Codecov Report

Merging #771 (5abba1e) into 2.x (61ce7d9) will increase coverage by 0.14%.
The diff coverage is 82.35%.

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@@             Coverage Diff              @@
##                2.x     #771      +/-   ##
============================================
+ Coverage     75.50%   75.64%   +0.14%     
  Complexity      116      116              
============================================
  Files           125      125              
  Lines          6825     6832       +7     
  Branches       1023     1025       +2     
============================================
+ Hits           5153     5168      +15     
- Misses         1136     1138       +2     
+ Partials        536      526      -10     

Impacted Files	Coverage Δ
.../opensearch/alerting/DocumentLevelMonitorRunner.kt	79.51% <82.35%> (+1.93%)	⬆️
...otlin/org/opensearch/alerting/alerts/AlertMover.kt	62.96% <0.00%> (-7.41%)	⬇️
...in/org/opensearch/alerting/MonitorRunnerService.kt	79.59% <0.00%> (-2.05%)	⬇️
...destinationmigration/DestinationConversionUtils.kt	68.88% <0.00%> (-1.12%)	⬇️
...ing/model/destination/DestinationContextFactory.kt	75.00% <0.00%> (ø)
...rg/opensearch/alerting/BucketLevelMonitorRunner.kt	79.56% <0.00%> (+0.43%)	⬆️
...ain/kotlin/org/opensearch/alerting/AlertService.kt	80.00% <0.00%> (+0.93%)	⬆️
.../org/opensearch/alerting/model/MonitorRunResult.kt	87.12% <0.00%> (+2.97%)	⬆️
...tlin/org/opensearch/alerting/util/AlertingUtils.kt	68.75% <0.00%> (+15.62%)	⬆️

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[opensearch-trigger-bot]

The backport to 2.3 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.3 2.3
# Navigate to the new working tree
cd .worktrees/backport-2.3
# Create a new branch
git switch --create backport/backport-771-to-2.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a69d762d79498d38f1c8d48255e135836010f177
# Push it to GitHub
git push --set-upstream origin backport/backport-771-to-2.3
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.3

Then, create a pull request where the base branch is 2.3 and the compare/head branch is backport/backport-771-to-2.3.

[opensearch-trigger-bot]

The backport to 2.4 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.4 2.4
# Navigate to the new working tree
cd .worktrees/backport-2.4
# Create a new branch
git switch --create backport/backport-771-to-2.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a69d762d79498d38f1c8d48255e135836010f177
# Push it to GitHub
git push --set-upstream origin backport/backport-771-to-2.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.4

Then, create a pull request where the base branch is 2.4 and the compare/head branch is backport/backport-771-to-2.4.