Added support for "nested" mappings

[petardz]

Issue #, if available:

Description of changes:
Fixed bug where PUT _mapping against query index would fail in case of "nested" properties in index mappings

CheckList:
[ ] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[lezzago]

Can we make a new test for nested situation?

[codecov-commenter]

Codecov Report

Merging #645 (48a596b) into main (c6c12db) will decrease coverage by 0.31%.
The diff coverage is 81.25%.

@@             Coverage Diff              @@
##               main     #645      +/-   ##
============================================
- Coverage     76.37%   76.06%   -0.32%     
  Complexity      116      116              
============================================
  Files           124      124              
  Lines          6443     6497      +54     
  Branches        942      960      +18     
============================================
+ Hits           4921     4942      +21     
- Misses         1040     1066      +26     
- Partials        482      489       +7     

Impacted Files	Coverage Δ
...opensearch/alerting/util/DocLevelMonitorQueries.kt	80.00% <81.25%> (+0.45%)	⬆️
.../alerting/transport/TransportIndexMonitorAction.kt	64.65% <0.00%> (-5.70%)	⬇️
...destinationmigration/DestinationConversionUtils.kt	71.11% <0.00%> (-1.12%)	⬇️
...nationmigration/DestinationMigrationUtilService.kt	81.45% <0.00%> (-0.81%)	⬇️
...rch/alerting/resthandler/RestIndexMonitorAction.kt	81.03% <0.00%> (+0.33%)	⬆️
.../kotlin/org/opensearch/alerting/util/IndexUtils.kt	72.91% <0.00%> (+2.08%)	⬆️
...alerting/transport/TransportSearchMonitorAction.kt	75.00% <0.00%> (+2.50%)	⬆️

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[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-645-to-2.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 42abf4d2247e5629694dfd922cefcce23d4bd207
# Push it to GitHub
git push --set-upstream origin backport/backport-645-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-645-to-2.4.

[opensearch-trigger-bot]

The backport to 2.x 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.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-645-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 42abf4d2247e5629694dfd922cefcce23d4bd207
# Push it to GitHub
git push --set-upstream origin backport/backport-645-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-645-to-2.x.

[opensearch-trigger-bot]

The backport to 2.x 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.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-645-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 42abf4d2247e5629694dfd922cefcce23d4bd207
# Push it to GitHub
git push --set-upstream origin backport/backport-645-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-645-to-2.x.