code: @Indexable(type = IndexableType.REINDEX)
  	@Override
  	public CommerceDiscount updateCommerceDiscount(
  		CommerceDiscount commerceDiscount) {
  		return commerceDiscountPersistence.update(commerceDiscount);
  	}
docs: Updates the commerce discount in the database or adds it if it does not yet exist. Also notifies the appropriate model listeners.
  
  @param commerceDiscount the commerce discount
  @return the commerce discount that was updated