Fixes KNN search formulas

[kolchfa-aws]

Fixes #1258

Checklist

• [ x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.
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[opensearch-trigger-bot]

The backport to 1.3 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-1.3 1.3
# Navigate to the new working tree
cd .worktrees/backport-1.3
# Create a new branch
git switch --create backport/backport-1447-to-1.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2c7494309a9fbff0aa651da3665e2b1349cb599b
# Push it to GitHub
git push --set-upstream origin backport/backport-1447-to-1.3
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.3

Then, create a pull request where the base branch is 1.3 and the compare/head branch is backport/backport-1447-to-1.3.

[opensearch-trigger-bot]

The backport to 2.0 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-2.0 2.0
# Navigate to the new working tree
cd .worktrees/backport-2.0
# Create a new branch
git switch --create backport/backport-1447-to-2.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2c7494309a9fbff0aa651da3665e2b1349cb599b
# Push it to GitHub
git push --set-upstream origin backport/backport-1447-to-2.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.0

Then, create a pull request where the base branch is 2.0 and the compare/head branch is backport/backport-1447-to-2.0.

[opensearch-trigger-bot]

The backport to 2.1 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-2.1 2.1
# Navigate to the new working tree
cd .worktrees/backport-2.1
# Create a new branch
git switch --create backport/backport-1447-to-2.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2c7494309a9fbff0aa651da3665e2b1349cb599b
# Push it to GitHub
git push --set-upstream origin backport/backport-1447-to-2.1
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.1

Then, create a pull request where the base branch is 2.1 and the compare/head branch is backport/backport-1447-to-2.1.