Remove support for legacy es test clusters

[adnapibar]

Description

This commit removes the support we added for running test clusters for legacy ES versions for bwc tests.

Issues Resolved

N/A

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.

Signed-off-by: Rabi Panda adnapibar@gmail.com

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/7041/
• CommitID: 5865cf2

[dblock]

Are you removing ODFE along the way?

[adnapibar]

Are you removing ODFE along the way?

@dblock not sure which ones you're referring to?

[dblock]

Are you removing ODFE along the way?

@dblock not sure which ones you're referring to?

I had noticed things like DISTRO_EXTRACTED_CONFIG_PREFIX="opensearch_distro_extracted_ ", is that not ODFE-related and I just see "distro" everywhere? if so ignore me.

[adnapibar]

Are you removing ODFE along the way?

@dblock not sure which ones you're referring to?

I had noticed things like DISTRO_EXTRACTED_CONFIG_PREFIX="opensearch_distro_extracted_ ", is that not ODFE-related and I just see "distro" everywhere? if so ignore me.

Yeah, for a second I got confused :) no that's just a short for distribution, no relation to ODFE.