code: protected void notifyEntities(List<HookNotification.HookNotificationMessage> messages) {
          final int maxRetries = atlasProperties.getInt(getNumberOfRetriesPropertyKey(), 3);
          notifyEntities(messages, maxRetries);
      }
docs: Notify atlas of the entity through message. The entity can be a
  complex entity with reference to other entities.
  De-duping of entities is done on server side depending on the
  unique attribute on the entities.
  
  @param messages hook notification messages