code: public <E> List<E> loadByName(Class<E> entityClass, List<String> identifiers) {
      Key[] nativeKeys = stringListToNativeKeys(entityClass, identifiers);
      return fetch(entityClass, nativeKeys);
    }
docs: Loads and returns the entities with the given <b>names (a.k.a String IDs)</b>. The entities are
  assumed to be root entities (no parent). The entity kind is determined from the supplied class.
  
  @param entityClass
  the entity class
  @param identifiers
  the IDs of the entities
  @return the list of entity objects in the same order as the given list of identifiers. If one
  or more requested IDs do not exist in the Cloud Datastore, the corresponding item in
  the returned list be <code>null</code>.
  @throws EntityManagerException
  if any error occurs while inserting.