BasicAuthentication option in ConnectionSettings still causing certificate errors in OpenSearch .net client

OpenSearch Client Libraries
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
OpenSearch 2.15
OpenSearch.Client, 1.7.1

Describe the issue:
When attempting to connect to an OpenSearch instance using the OpenSearch .net client and BasicConnection the connection fails due to a certificate error (javax.net.ssl.SSLHandshakeException: Received fatal alert: unknown_ca). I can however connect to the OpenSearch instance using curl or a browser using the username and password.

Using the low level .net OpenSearch client in C#

var nodeAddress = new Uri("https://localhost:9200");
var config = new ConnectionConfiguration(nodeAddress).BasicAuthentication("admin", "admin");
var client = new OpenSearchLowLevelClient(config);

Any attempt to then run an operation such as indexing or querying on OpenSearch results in the CertificateError above. I thought BasicAuthentication should override certificate authentication so I should not be getting certificate errors. Is there anything I additionally need to do to enable BasicAuthentication in the .net client?

Configuration:

default OpenSearch installation in Docker as described in Installation quickstart - OpenSearch Documentation

Relevant Logs or Screenshots:

2

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