Retrieves a batch of <code>Records</code> from a <code>FeatureGroup</code>.
A list of <code>FeatureGroup</code> names, with their corresponding <code>RecordIdentifier</code> value, and Feature name that have been requested to be retrieved in batch.
Success
A list of Records you requested to be retrieved in batch.
A list of errors that have occurred when retrieving a batch of Records.
A unprocessed list of <code>FeatureGroup</code> names, with their corresponding <code>RecordIdentifier</code> value, and Feature name.