[Backport 2.x] Notification security fix

[opensearch-trigger-bot]

Backport e0b7a5a from #852

[codecov-commenter]

Codecov Report

Merging #861 (9a4cd14) into 2.x (4f5d97b) will increase coverage by 0.25%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##                2.x     #861      +/-   ##
============================================
+ Coverage     76.37%   76.62%   +0.25%     
  Complexity      116      116              
============================================
  Files           125      125              
  Lines          7051     7055       +4     
  Branches       1033     1034       +1     
============================================
+ Hits           5385     5406      +21     
+ Misses         1139     1123      -16     
+ Partials        527      526       -1     

Impacted Files	Coverage Δ
...in/kotlin/org/opensearch/alerting/MonitorRunner.kt	65.88% <100.00%> (+2.59%)	⬆️
...rch/alerting/opensearchapi/OpenSearchExtensions.kt	56.66% <100.00%> (+6.66%)	⬆️

... and 8 files with indirect coverage changes

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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-861-to-2.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 6b3c09cb326e05ceabbd2d37d1b9d1ab233f5b81
# Push it to GitHub
git push --set-upstream origin backport/backport-861-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-861-to-2.3.

[opensearch-trigger-bot]

The backport to 2.5 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-2.5 2.5
# Navigate to the new working tree
cd .worktrees/backport-2.5
# Create a new branch
git switch --create backport/backport-861-to-2.5
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 6b3c09cb326e05ceabbd2d37d1b9d1ab233f5b81
# Push it to GitHub
git push --set-upstream origin backport/backport-861-to-2.5
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.5

Then, create a pull request where the base branch is 2.5 and the compare/head branch is backport/backport-861-to-2.5.