SPIKE: Identify the need for AWS Metadata server request

[jerico]

Having this code relies on AWS Metadata server being always available. There are instances where an ECS task cannot reach the metadata server which makes the task marked as unhealthy.

altis-enhanced-search/inc/namespace.php

Lines 361 to 362 in e5a196a

	$provider = CredentialProvider::defaultProvider();
	$credentials = call_user_func( $provider )->wait();

Check if this is critical or can be obtained elsewhere (environment variable) without relying on AWS Metadata server.