LUCENE-9798 : Fix looping bug when calculating full KNN results in KnnGraphTester

[nitirajrathore]

Description

There was a bug in the KNN Tester where in for large document vector files only first set of documents will be considered for Full Knn calculation

#10837

Solution

Fixed the bug and also made the code to execute parallelly, so as to take less time for large document vector files.

Tests

Created an abstraction to get ByteBuffers and used a simple wrapper over to test the core functionality. Created test cases for successful and exceptional cases.

Checklist

Please review the following and check all that apply:

• [Check] I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• [Check ] I have created a Jira issue and added the issue ID to my pull request title.
• [ Check] I have given Lucene maintainers access to contribute to my PR branch. (optional but recommended)
• [Check ] I have developed this patch against the main branch.
• [ Check] I have run ./gradlew check.
• [Check ] I have added tests for my changes.

[rmuir]

Fixed the bug and also made the code to execute parallelly, so as to take less time for large document vector files.

please, these need to be 2 separate issues.

[nitirajrathore]

Fixed the bug and also made the code to execute parallely, so as to take less time for large document vector files.

please, these need to be 2 separate issues.

Sure @rmuir , I have reverted the changes for parallel execution from this PR. I will address that separately in a different PR and issue.

@msokolov : I will address issues related to parallel execution code in a separate PR.

[mikemccand]

Thanks @nitirajrathore! This class has since moved to luceneutil I think? Do you know if this bug was resolved there? If not, could you maybe port this PR over to luceneutil? Thanks.

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