Fixed compilation errors after refactoring in core Strings class

[martin-gaievski]

Description

Fixed compilation errors after changes in core Strings classes (core PR)

Check List

• All tests pass
• Commits are signed as 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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #243 (2e45f32) into main (61e6e98) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #243   +/-   ##
=========================================
  Coverage     86.23%   86.23%           
  Complexity      337      337           
=========================================
  Files            28       28           
  Lines           981      981           
  Branches        153      153           
=========================================
  Hits            846      846           
  Misses           69       69           
  Partials         66       66           

[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-243-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 b9c86a817e7c2b421430624ea629fcc8908da374
# Push it to GitHub
git push --set-upstream origin backport/backport-243-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-243-to-2.x.