The AccountId value is the AWS account ID. This value must match the AWS
account ID associated with the credentials used to sign the request. You can either specify
an AWS account ID or optionally a single '-' (hyphen), in which case Amazon
Glacier uses the AWS account ID associated with the credentials used to sign the request.
If you specify your account ID, do not include any hyphens ('-') in the ID.
Input for GetDataRetrievalPolicy.