private void clearSummaryAttributeAspectForConcreteFields() {
        for (SDField field : schema.allConcreteFields()) {
            if (field.getDataType() instanceof NewDocumentReferenceDataType) {
                removeFromAttributePrefetchSummaryClass(field);
                clearSummaryTransformOnSummaryFields(field);
            }
        }
    }
Class that processes reference fields and removes attribute aspect of such fields from summary.

A document summary for a reference field should always be fetched from the document instance in back-end
as the attribute vector does not store the original document id string.

@author geirst
config-model/src/main/java/com/yahoo/schema/processing/ReferenceFieldsProcessor.java