synchronized void sync() {
   while (eventIndicies.hasNext()) {
     EventId eventId = eventIndicies.next();
     Object fieldValue = typedEventRepo.readEventField(eventId, eventFieldId.getFieldName());
     entries.add(new EventFieldEntry(eventId, fieldValue));
   }
 }
 @Override
 public EventTypeId getEventTypeId() {
   return eventFieldId.getEventTypeId();
 }