OpenSearch Serverless Authentication with AWS IAM Credentials in .NET Application

Problem Description: I’m trying to use OpenSearch Serverless in my .NET application, but I’m having trouble with authentication using my AWS IAM credentials. Here are the details:

Issue:

• I have a collection with public availability in OpenSearch.
• I can access the OpenSearch Dashboard without any issues.
• However, when I try to connect to the server from my .NET application using the NuGet package OpenSearch.Client, I’m not sure how to use my AWS IAM credentials.
• Every attempt results in a 403 Forbidden response.

Questions: How can I properly authenticate my .NET application with OpenSearch Serverless using my AWS IAM credentials? Are there specific permissions I need to configure for this?

Desired Outcome: I want to be able to make authenticated requests to OpenSearch Serverless from my .NET application using my AWS IAM credentials.