Configurable merge policy and option to choose between LogByteSize and Tiered MergePolicy

[rishabhmaurya]

Description

#9241
currently due to lack of appropriate benchmark, we don't have a promising numbers to show the benefits. Thus keeping tiered merge policy as default until we have enough confidence on the change to make it as a default for data streams.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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]

Compatibility status:

Checks if related components are compatible with change 7caa621

Incompatible components

Skipped components

Compatible components

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

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/25394/
• CommitID: 10816c8

[codecov]

Codecov Report

Merging #9992 (13fc7cc) into main (e156582) will decrease coverage by 0.07%.
Report is 1 commits behind head on main.
The diff coverage is 82.53%.

❗ Current head 13fc7cc differs from pull request most recent head 7caa621. Consider uploading reports for the commit 7caa621 to get more accurate results

@@             Coverage Diff              @@
##               main    #9992      +/-   ##
============================================
- Coverage     71.18%   71.12%   -0.07%     
+ Complexity    58241    58220      -21     
============================================
  Files          4830     4831       +1     
  Lines        274592   274598       +6     
  Branches      40020    40008      -12     
============================================
- Hits         195469   195296     -173     
- Misses        62701    62959     +258     
+ Partials      16422    16343      -79     

Files	Coverage Δ
...rg/opensearch/common/settings/ClusterSettings.java	92.85% <ø> (ø)
...pensearch/common/settings/IndexScopedSettings.java	100.00% <ø> (ø)
...in/java/org/opensearch/index/shard/IndexShard.java	69.92% <100.00%> (+0.40%)	⬆️
.../main/java/org/opensearch/index/IndexSettings.java	86.78% <89.83%> (+0.36%)	⬆️
...rg/opensearch/index/TieredMergePolicyProvider.java	73.68% <70.83%> (ø)
...ensearch/index/LogByteSizeMergePolicyProvider.java	78.57% <78.57%> (ø)

... and 453 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/25500/
• CommitID: bd49090
  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?

[reta]

@msfroh good to go?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/26602/
• CommitID: 7caa621

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-9992-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fa66bebf88d6fc69765d5ecb26930ece94477024
# Push it to GitHub
git push --set-upstream origin backport/backport-9992-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-9992-to-2.x.

[rishabhmaurya]

thanks @reta and @msfroh. Working on backport manually

[rishabhmaurya]

2.x backport PR - #10312

[reta]

@rishabhmaurya please create a documentation issue / section for this new setting(s) here , github.com/Opensearch-project/documentation-website/, we'll need it for 2.11 release, thank you.

[rishabhmaurya]

@reta I have the issue opened for documentation opensearch-project/documentation-website#5119 thank you.