Fix test bwcSerialization issue in ForceMergeRequestTests

[gaobinlong]

Description

As discussed in #12657, we should correct the version field in ForceMergeRequests.testBwcSerialization(), use the same version in both streamInput and streamOutput. The issue was fixed in that PR, but it cannot be backported to the 2.x branch because the serialization is different in main and 2.x, so we need to fix the issue in 2.x manually.

Changelog is not needed.

Related Issues

#8021

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[gaobinlong]

@sohami, please help to review this PR, thank you!

[github-actions]

Compatibility status:

Checks if related components are compatible with change e2d72d5

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

❌ Gradle check result for e2d72d5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[gaobinlong]

❌ Gradle check result for e2d72d5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Known issue:#5198

[github-actions]

✅ Gradle check result for e2d72d5: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.17%. Comparing base (0dd892c) to head (e2d72d5).
Report is 53 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12778      +/-   ##
============================================
- Coverage     71.28%   71.17%   -0.11%     
- Complexity    60145    60259     +114     
============================================
  Files          4957     4972      +15     
  Lines        282799   283745     +946     
  Branches      41409    41498      +89     
============================================
+ Hits         201591   201966     +375     
- Misses        64189    64758     +569     
- Partials      17019    17021       +2     

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