[Backport 2.x] Increase suite timeout for HighlighterSearchIT

[opensearch-trigger-bot]

Backport 9814eb9 from #12512.

[github-actions]

Compatibility status:

Checks if related components are compatible with change b785e0d

Incompatible components

Skipped components

Compatible components

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

[github-actions]

❕ Gradle check result for b785e0d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.get_field_mapping/20_missing_field/Return empty object if field doesn't exist, but index does}

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.26%. Comparing base (e252875) to head (b785e0d).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12516      +/-   ##
============================================
- Coverage     71.29%   71.26%   -0.04%     
+ Complexity    60070    60054      -16     
============================================
  Files          4945     4945              
  Lines        282349   282349              
  Branches      41369    41369              
============================================
- Hits         201298   201206      -92     
- Misses        64035    64150     +115     
+ Partials      17016    16993      -23     

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