Fix unchecked cast in dynamic action map getter

[dbwiddis]

Description

Fixes an unchecked cast in dynamic action map getter

Related Issues

Resolves #15388

Check List

• Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[dblock]

Rebase?

[github-actions]

✅ Gradle check result for 8d91255: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.83%. Comparing base (0eb63bd) to head (48d55e8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15394      +/-   ##
============================================
- Coverage     71.90%   71.83%   -0.07%     
+ Complexity    63244    63172      -72     
============================================
  Files          5224     5224              
  Lines        296077   296079       +2     
  Branches      42762    42763       +1     
============================================
- Hits         212884   212701     -183     
- Misses        65661    65941     +280     
+ Partials      17532    17437      -95     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dbwiddis]

Rebase?

Of course. I suspect the vast majority of failed backports and rebases are due to always appending to the end of the same changelog. :|

[github-actions]

✅ Gradle check result for 48d55e8: SUCCESS

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-15394-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 6152afeef3ceb3fe4f18f6be2d55ac60256bc2db
# Push it to GitHub
git push --set-upstream origin backport/backport-15394-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-15394-to-2.x.