Conflicting guidance on License Headers

The CONTRIBUTING.md file in this repository specifies a longer license header.

This conflicts with apparent (authoritative?) guidance posted in a comment on the alerting project repo here, although the qualification of "like this one" isn't clear:
https://github.com/opensearch-project/alerting/issues/136#issuecomment-966657180

There was an apparently more authoritative version in issue #21 and PR #29 where the CONTRIBUTING file was updated with a shorter version.
@dblock asked:

is the short version the preferred version, @hyandell?

@hyandell replied:

Yes, that's the preferred version.

But then @dblock updated the header in #76 to include the more expansive language presently in the header based on this issue: https://github.com/opensearch-project/opensearch-java/pull/178

That update stated that the change was "confirmed" but did not cite a reference.

But we still have some PRs updating per the older guidance such as https://github.com/opensearch-project/OpenSearch/pull/4657

My ask:

1. Please confirm that the header in this repo's CONTRIBUTING file is the latest official guidance
2. Suggest someone with the admin-powers to do so edit the conflicting guidance in the linked issues above to add an "update" which points to the latest guidance

Review CONTRIBUTING.md and compare its license-header guidance with the comment in alerting issue #136, issue #21, PR #29, and the update in #76. This requires an authoritative decision on which wording is current; done means confirming the official guidance and updating the conflicting linked issues to point to it.