msearch_template fails on request

[bashpound]

Describe the feature:

Elasticsearch version (bin/elasticsearch --version):
7.17.8

elasticsearch-py version (elasticsearch.__versionstr__):
7.17.0

Please make sure the major version matches the Elasticsearch server you are running.

b = [{ "index": "some-index*" },
     { "id": "template_id", "params": { "keyword": "key"}},
     { "index": "some-other-index*" },
     { "id": "template_id2", "params": { "keyword": "key"}}]

es.msearch_template(body=b)  // OR
es.msearch_template(search_templates=b) 

// result in the same error below:

---------------------------------------------------------------------------
BadRequestError                           Traceback (most recent call last)
<ipython-input-75-a87865ceb6d2> in <module>
      5 
      6 
----> 7 es.msearch_template(body=b)

\python\python38\lib\site-packages\elasticsearch\_sync\client\utils.py in wrapped(*args, **kwargs)
    402                         pass
    403 
--> 404             return api(*args, **kwargs)
    405 
    406         return wrapped  # type: ignore[return-value]

\python\python38\lib\site-packages\elasticsearch\_sync\client\__init__.py in msearch_template(self, search_templates, index, ccs_minimize_roundtrips, error_trace, filter_path, human, max_concurrent_searches, pretty, rest_total_hits_as_int, search_type, typed_keys)
   2646             "content-type": "application/x-ndjson",
   2647         }
-> 2648         return self.perform_request(  # type: ignore[return-value]
   2649             "POST", __path, params=__query, headers=__headers, body=__body
   2650         )

\python\python38\lib\site-packages\elasticsearch\_sync\client\_base.py in perform_request(self, method, path, params, headers, body)
    319                     pass
    320 
--> 321             raise HTTP_EXCEPTIONS.get(meta.status, ApiError)(
    322                 message=message, meta=meta, body=resp_body
    323             )

BadRequestError: BadRequestError(400, 'action_request_validation_exception', 'Validation Failed: 1: no requests added;')

[sethmlarson]

I'm not able to reproduce your exact error, are you able to try sending the same request via curl to see if this is an issue with the API call itself rather than the client? The msearch_template API being generated doesn't look like it's doing anything funky when comparing it to the API documentation.

[sethmlarson]

Closing this until we receive more information.