[Backport 2.x] Default to mmapfs within hybridfs

[opensearch-trigger-bot]

Backport b58bec4 from #8508.

[opensearch-trigger-bot]

Compatibility status:

Checks if related components are compatible with change 2a3e020

Incompatible components

Incompatible components: [https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/performance-analyzer.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/performance-analyzer-rca.git]

[codecov]

Codecov Report

Merging #9377 (68aae94) into 2.x (2a3e020) will increase coverage by 0.02%.
Report is 2 commits behind head on 2.x.
The diff coverage is 86.84%.

@@             Coverage Diff              @@
##                2.x    #9377      +/-   ##
============================================
+ Coverage     70.85%   70.88%   +0.02%     
- Complexity    57540    57587      +47     
============================================
  Files          4761     4761              
  Lines        271849   271883      +34     
  Branches      40087    40093       +6     
============================================
+ Hits         192618   192723     +105     
+ Misses        62692    62672      -20     
+ Partials      16539    16488      -51     

Files Changed	Coverage Δ
...pensearch/common/settings/IndexScopedSettings.java	100.00% <ø> (ø)
...rc/main/java/org/opensearch/index/IndexModule.java	82.35% <81.48%> (-0.14%)	⬇️
...org/opensearch/index/store/FsDirectoryFactory.java	79.72% <100.00%> (+2.11%)	⬆️

... and 483 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/22851/
• CommitID: 68aae94
  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?

[kotwanikunal]

#8059

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/22851/
• CommitID: 68aae94
  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?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/22857/
• CommitID: 68aae94