Changes to Get a volume.

removed the optional property appInstanceId from the response with the 200 status

the endpoint scheme security ApiKeyAuth was added to the API

added the media type application/json for the response with the status 404

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

added the non-success response with the status 500

added the optional property groupInstanceId to the response with the 200 status

added the required property durability to the response with the 200 status