Implement OpenSearch core branching strategy

[prudhvigodithi]

Description

Ensure MAJOR_VERSION.x branch exists, the main branch acts as source of truth effectively working on 2 versions at the same time.

Related META issue

opensearch-project/opensearch-plugins#142

Current Behavior

Currently plugins follow a branching strategy where they work on main for the next development iteration, effectively working on 2 versions at the same time. This is not always true for all plugins, the release branch or branch pattern is not consistent, the lack of this standardization would limit multiple automation workflows and alignment with core repo. More details on META ISSUE

Proposed solution

Follow OpenSearch core branching. Create 1.x and 2.x branches, do not create 2.0 as a branch of main, instead create main -> 2.x -> 2.0. Maintain working CI for 3 releases at any given time.

[prudhvigodithi]

Hey @vamshin @VijayanB can you please post an update and make the necessary changes to align with core branching strategy.
Thank you
@dblock @bbarani @CEHENKLE

[navneet1v]

@prudhvigodithi The branching strategy has been implemented, I can see main pointing to 3.0, 2.x pointing to latest 2.2 release.. We don't have 1.x, 2.0 and 2.1 branches as this repo was not launched at that time. Please provide details what else is missing.

[navneet1v]

@VijayanB can you please check if there is any action item left on this?

[VijayanB]

Following core's branching strategy. No action is required.

[dblock]

Could you please double-check that:

• main is building 3.0
• 2.x is building next 2.x, which is currently 2.4.0
• 2.3 is building next 2.3, which is 2.3.1
• manifests in https://github.com/opensearch-project/opensearch-build/tree/main/manifests include all 3

[navneet1v]

Tasks completed

• main is building 3.0
• 2.x is building next 2.x, which is currently 2.4.0
• 2.3 is building next 2.3, which is 2.3.1
• manifests in https://github.com/opensearch-project/opensearch-build/tree/main/manifests include all 3

[navneet1v]

As per the latest update, 2.3.1 release is not happening. So I won't do the version update. Will work on adding this repo in the 3.0 and 2.4 manifest files.

[navneet1v]

PR opensearch-project/opensearch-build#2675