[FEATURE] Deprecate ML APIs in py-ml

[nathaliellenaa]

Is your feature request related to a problem?
In regard to this proposal, we have moved all ML APIs from opensearch-py-ml to opensearch-py. Therefore, users can deploy opensearch-py only to use the ML functionalities.

What solution would you like?
We can give users some time to adapt to the new changes and started to deprecate ML APIs in opensearch-py-ml.

Do you have any additional context?
We can refer to this issue to look for all ML APIs.

[nathaliellenaa]

Here are the task breakdowns:

• Update UPGRADING.md file in opensearch-py to explain the changes (ref)
• Add deprecation warning in py-ml (ref)
  • Update README.md file to explain the deprecation
• Add deprecation banner to py-ml in the opensearch documentation (ref)

Extra:

• Add log in py-ml that shows a deprecation message every time users run the ML APIs code.

I referred this from the deprecation of opensearch-dsl-py, what do you think about this @dhrubo-os ?

[andrross]

Catch All Triage - 1, 2, 3, 4, 5