[BugFix] Fixing KNNMethodContext resolution when documents are ingested and a flaky test

[navneet1v]

Description

Fixing KNNMethodContext resolution when documents are ingested and a flaky test

Bug Fixes:

1. When mode and compression is provided and documents are ingested, the rescore parameter was not getting passed in during search, as in the FieldMapper mergeBuilder Mode and compression attributes were not getting set.
2. There was a flaky test testDeletedDocsWithSegmentMerge_whenValid_ThenSucceed. It was added in the PR: https://github.com/opensearch-project/k-NN/pull/2046 to test that merges are happening without any failures. But as this test was doing search at the end it is not necessary that search will always give consistent results as the documents are deleted. Hence the correct test for this is ensuring the index is green after the merge. The flakiness was observed here: https://github.com/opensearch-project/k-NN/pull/2046

Issue

https://github.com/opensearch-project/k-NN/issues/1949

Check List

• [X] New functionality includes testing.
• [X] New functionality has been documented.
• [X] 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. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[opensearch-trigger-bot[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-2072-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8f6b177986ab89676fcca2b1fdedad580896b8c3
# Push it to GitHub
git push --set-upstream origin backport/backport-2072-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-2072-to-2.x.

[opensearch-trigger-bot[bot]]

The backport to 2.17 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-2.17 2.17
# Navigate to the new working tree
cd .worktrees/backport-2.17
# Create a new branch
git switch --create backport/backport-2072-to-2.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8f6b177986ab89676fcca2b1fdedad580896b8c3
# Push it to GitHub
git push --set-upstream origin backport/backport-2072-to-2.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.17

Then, create a pull request where the base branch is 2.17 and the compare/head branch is backport/backport-2072-to-2.17.

[opensearch-trigger-bot[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-2072-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8f6b177986ab89676fcca2b1fdedad580896b8c3
# Push it to GitHub
git push --set-upstream origin backport/backport-2072-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-2072-to-2.x.

[opensearch-trigger-bot[bot]]

The backport to 2.17 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-2.17 2.17
# Navigate to the new working tree
cd .worktrees/backport-2.17
# Create a new branch
git switch --create backport/backport-2072-to-2.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8f6b177986ab89676fcca2b1fdedad580896b8c3
# Push it to GitHub
git push --set-upstream origin backport/backport-2072-to-2.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.17

Then, create a pull request where the base branch is 2.17 and the compare/head branch is backport/backport-2072-to-2.17.