Bumped gradle to 9.4.1

[MrFlap]

Description

Updates the Gradle wrapper from 9.2.0 to 9.4.1 to align with core OpenSearch, which moved to 9.4.1 in opensearch-project/OpenSearch#21153 as well as bumping jacoco from 0.8.13 to 0.8.14. Keeping the k-NN plugin's Gradle version in sync with core avoids build-tool drift and ensures compatibility with core's build-tools conventions.

Changes:

• gradle/wrapper/gradle-wrapper.properties — bumped distributionUrl to gradle-9.4.1-all.zip and updated distributionSha256Sum to the official checksum.
• gradle/wrapper/gradle-wrapper.jar — replaced with the wrapper jar from core OpenSearch (SHA f8e1ee3125fe0768e9a76ee977ac089eb657005e).

Verified by running ./gradlew compileJava and ./gradlew spotlessApply locally — both pass on Gradle 9.4.1 with JDK 25.

Related Issues

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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.

[github-actions]

PR Code Analyzer ❗

AI-powered 'Code-Diff-Analyzer' found issues on commit 00755f1.

Path	Line	Severity	Description
gradle/wrapper/gradle-wrapper.jar	1	high	Binary build bootstrap JAR replaced. The gradle-wrapper.jar executes during every build to download and invoke Gradle; a tampered binary could run arbitrary code in CI/CD and developer environments. Contents cannot be inspected in the diff. Maintainers must verify the new JAR matches the official Gradle 9.4.1 wrapper JAR (e.g., via checksum against the canonical Gradle distribution).
gradle/wrapper/gradle-wrapper.properties	4	high	Gradle distribution URL and SHA-256 changed (9.2.0 → 9.4.1, new hash: 708d2c6ecc97ca9a11838ef64a6c2301151b8dd10387e22dc1a12c30557cab5b). Every developer and CI job will download this new distribution. Maintainers must confirm the SHA-256 matches the value published on the official Gradle release page for gradle-9.4.1-all.zip before merging.
build-tools/knnplugin-coverage.gradle	9	high	Jacoco code-coverage library version bumped from 0.8.13 to 0.8.14. Dependency version changes must be flagged per policy regardless of apparent legitimacy; maintainers should verify the new artifact hash against the official Jacoco release and confirm it matches what core OpenSearch uses.

The table above displays the top 10 most important findings.

Total: 3 | Critical: 0 | High: 3 | Medium: 0 | Low: 0

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Pull Requests Author(s): Please update your Pull Request according to the report above.

Repository Maintainer(s): You can bypass diff analyzer by adding label skip-diff-analyzer after reviewing the changes carefully, then re-run failed actions. To re-enable the analyzer, remove the label, then re-run all actions.

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⚠️ Note: The Code-Diff-Analyzer helps protect against potentially harmful code patterns. Please ensure you have thoroughly reviewed the changes beforehand.

Thanks.

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review Checksum Verification The distributionSha256Sum value should be verified against the official Gradle 9.4.1 release checksum published at https://gradle.org/release-checksums/. An incorrect checksum could allow a tampered distribution to be used silently. distributionSha256Sum=708d2c6ecc97ca9a11838ef64a6c2301151b8dd10387e22dc1a12c30557cab5b distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-all.zip

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.42%. Comparing base (af6d18d) to head (00755f1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3308      +/-   ##
============================================
- Coverage     83.48%   83.42%   -0.07%     
+ Complexity     4269     4265       -4     
============================================
  Files           450      450              
  Lines         15509    15509              
  Branches       2006     2006              
============================================
- Hits          12948    12938      -10     
- Misses         1768     1776       +8     
- Partials        793      795       +2     

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