Fixing multiple issues reported in #497

[martin-gaievski]

Description

Fixed multiple issue in scope of this PR:

• Allow multiple identical sub-queries in hybrid query
• Allow total_hits flag usage
• Move check for mismatch of number of docs in fetch and query results to earlier stage, so normalization is not even called. current behavior is to throw an exception and fail search query

Issues Resolved

#497

Check List

• New functionality includes testing.
  • 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

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (5daddfd) 84.55% compared to head (7ea7d90) 84.33%.

Files	Patch %	Lines
...ensearch/neuralsearch/query/HybridQueryScorer.java	70.00%	4 Missing and 2 partials ⚠️
...arch/processor/NormalizationProcessorWorkflow.java	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #524      +/-   ##
============================================
- Coverage     84.55%   84.33%   -0.22%     
- Complexity      532      533       +1     
============================================
  Files            40       40              
  Lines          1547     1564      +17     
  Branches        244      244              
============================================
+ Hits           1308     1319      +11     
- Misses          128      133       +5     
- Partials        111      112       +1     

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[navneet1v]

Update the PR description to:
Fixing multiple issues reported in #497.

same for the change log.

[navneet1v]

Please add an IT for case when there are same queries in hyrbid query clause.

[martin-gaievski]

Please add an IT for case when there are same queries in hyrbid query clause.

added IT as requested

[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-524-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 585fbbe0da23bdb827bf012a85d6b2dc9af78c11
# Push it to GitHub
git push --set-upstream origin backport/backport-524-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-524-to-2.x.