Currently, mongod uses the same TaskExecutor to execute search queries and to issue Search Index Management commands.  This executor can be configured with a skipAuthenticationToMongot parameter, which configures this TaskExecutor to issue requests without authentication.

In the decoupled Atlas Search architecture, both search query commands and search index management commands will be sent to a local Envoy, without authentication.

However, in the coupled Atlas Search architecture, search query commands should be sent directly to mongot, with authentication.  Search Index Management commands will be sent to the local Envoy, without authentication (same as the decoupled architecture).

We need a way to configure mongod & mongos in the coupled architecture to provide authentication when making search query requests, but skip authentication when making search index management requests.