[Backport 2.x] Add AutoExpandReplica in the validation of replica count enforcement

[Arpit-Bandejiya]

Description

Backporting the changes merged in #4994.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/6276/
• CommitID: 174561d
  Please examine the workflow log, locate, and copy-paste the failure below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/6277/
• CommitID: f940a31
  Please examine the workflow log, locate, and copy-paste the failure below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[Bukhtawar]

Overriding as Jenkins has failure due to opensearch-project/opensearch-ci#222 and local builds are passing