[BUG] 2.1.0 is failing against Managed OpenSearch

[dblock]

What is the bug?

I upgraded opensearch-py to 2.1.0 from 2.0.1.

How can one reproduce the bug?

Upgrade https://github.com/dblock/opensearch-python-client-demo to 2.1.0. Starts failing.

$ pipenv run python example.py
opensearch: 1.3.2
Traceback (most recent call last):
  File "/Users/dblock/source/dblock/opensearch-python-client-demo/example.py", line 46, in <module>
    client.index(index=index, body=document, id='1', refresh=True)
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/client/utils.py", line 178, in _wrapped
    return func(*args, params=params, headers=headers, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/client/__init__.py", line 355, in index
    return self.transport.perform_request(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/transport.py", line 408, in perform_request
    raise e
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/transport.py", line 369, in perform_request
    status, headers_response, data = connection.perform_request(
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/connection/http_requests.py", line 219, in perform_request
    self._raise_error(
  File "/Users/dblock/.local/share/virtualenvs/opensearch-python-client-demo-ejYmDdj0/lib/python3.11/site-packages/opensearchpy/connection/base.py", line 301, in _raise_error
    raise HTTP_EXCEPTIONS.get(status_code, TransportError)(
opensearchpy.exceptions.AuthorizationException: AuthorizationException(403, '{"message":"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.\\n\\nThe Canonical String for this request should have been\\n\'PUT\\n/movies/_doc/1\\nrefresh=true\\nhost:search-dblock-test-opensearch-13-ndeeeijq6ei747szqcfcnp4z5q.us-west-2.es.amazonaws.com\\nx-amz-date:20230123T221754Z\\nx-amz-security-token:...\'\\n"}')