[BUG] Bulk operation throwing 'action_request_validation_exception" when doing bulk delete.

[ausmanlumeris]

What is the bug?

When using helpers.bulk to delete objects in bulk, the helpers.bulk function throws the exception shown below. I noticed there are no examples of doing a delete in the documentation.

raise HTTP_EXCEPTIONS.get(status_code, TransportError)(
opensearchpy.exceptions.RequestError: RequestError(400, 'action_request_validation_exception', 'Validation Failed: 1: index is missing;')

How can one reproduce the bug?

Use this code.

docs = [{"delete": {"_index": "<index name", "_id": "<id>"}}]           
helpers.bulk(client, docs)

What is the expected behavior?

The bulk function should be able to delete objects in bulk. The same request works fine from postman when going directly against the opensearch '_bulk' API.

What is your host/environment?

OS: MacOS 14.7.1 (23H222)
Python 3.12.3
opensearch-py: 2.8.0

[dblock]

Looks like a bug. Want to try and write a (failing) test for this @ausmanlumeris?