Fix core package name to address compilation errors

[martin-gaievski]

Description

Fix compilation errors after code refactoring PR. Core PR is marked with "backport 2.x", so similar change may be required in 2.x branch as well.

In this PR it's only changing package name of core classes in import section

Noticed in scope of fixing same for neural-search: opensearch-project/neural-search#219

Check List

• All tests pass
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #1122 (b7e561f) into main (0e834a8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1122   +/-   ##
=========================================
  Coverage     84.12%   84.12%           
  Complexity     1755     1755           
=========================================
  Files           139      139           
  Lines          6716     6716           
  Branches        669      669           
=========================================
  Hits           5650     5650           
  Misses          769      769           
  Partials        297      297           

Flag	Coverage Δ
ml-commons	84.12% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ction/deploy/TransportDeployModelOnNodeAction.java	97.40% <ø> (ø)
.../opensearch/ml/action/handler/MLSearchHandler.java	86.66% <ø> (ø)
...h/ml/action/models/DeleteModelTransportAction.java	83.09% <ø> (ø)
...arch/ml/action/models/GetModelTransportAction.java	80.00% <ø> (ø)
...arch/ml/action/profile/MLProfileModelResponse.java	100.00% <ø> (ø)
...search/ml/action/profile/MLProfileNodeRequest.java	100.00% <ø> (ø)
...earch/ml/action/profile/MLProfileNodeResponse.java	89.18% <ø> (ø)
...opensearch/ml/action/profile/MLProfileRequest.java	100.00% <ø> (ø)
...pensearch/ml/action/profile/MLProfileResponse.java	94.73% <ø> (ø)
...ch/ml/action/profile/MLProfileTransportAction.java	81.25% <ø> (ø)
... and 33 more

[MaxKsyunz]

Could you please backport this to 2.x?

The core refactor was backported yesterday -- opensearch-project/OpenSearch#8782

[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-1122-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 6bfc1d3a64e225ede879bd9c47527c474b25a8d3
# Push it to GitHub
git push --set-upstream origin backport/backport-1122-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-1122-to-2.x.

[MaxKsyunz]

I'm working on backporting this change to 2.x. PR will be up shortly.