Add support of default replica count change

[Arpit-Bandejiya]

Signed-off-by: Arpit Bandejiya abandeji@amazon.com

Description

Introduces a new cluster setting default_number_of_replicas. The setting set the default replica count to 1 by default. Once set, the default count for number_of_replicas will change based on the value.

Issues Resolved

Solves issue 5457

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.
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[github-actions]

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[gbbafna]

Please rebase from main . It should fix the test failures .

[github-actions]

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• CommitID: 231858d

[github-actions]

Gradle Check (Jenkins) Run Completed with:

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• CommitID: 80f8da0

[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:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-5610-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 12782f770a37eeebe39659bd39c4d528826dba2d
# Push it to GitHub
git push --set-upstream origin backport/backport-5610-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-5610-to-2.x.