[FEATURE] Support for ML Extensibility

[dtaivpp]

Is your feature request related to a problem?
At the moment it does not seem like we have API support for the ML Extensions as documented here: https://opensearch.org/docs/latest/ml-commons-plugin/extensibility/index/

What solution would you like?
I think we should provide support for these API's:

• Create external connector
• Create local connector/model

What alternatives have you considered?
N/A

Do you have any additional context?
The API's are well documented so should be as straigforward as replicating what was done with other endpoints.

[Vinay-Vinod]

Can I be assigned to this issue?

[dhrubo-os]

Sure, assigning you to the issue.

[dtaivpp]

@Vinay-Vinod Can we support the following endpoints for this? Here is the documentation that currently exists for ML connectors:

https://opensearch.org/docs/latest/ml-commons-plugin/extensibility/index/#step-2-create-a-connector

connection.ml_connector.create()
connection.ml_connector.delete()
connection.ml_connector.list()
connection.ml_connector.search()

[rawwar]

@dhrubo-os , can you assign me this issue. I'll be working on this one

[dhrubo-os]

@rawwar Thanks, assigned it to you.

[rawwar]

@dtaivpp, @dhrubo-os , Internal connectors are actually created by invoking model register endpoint. So, Do we want to have a separate method in the opensearch-py-ml that does it? Internally, it would be just calling model register. But, this create_internal_connector can act as a helper method.

Also, I think adding support for registering supported connectors, can be really useful. what do you think?

[dhrubo-os]

We don't need any separate method for internal connector. We need to corresponding functions for the api endpoints ml-commons have. So create/update/delete/search/get connectors should be fine.