code: public ListenableFuture<Void> deleteAsync(final Class<?> entityClass, final Object id,
        final Mapper.Option... options) {
      Mapper mapper = mapper(entityClass);
      return mapper.deleteAsync(id, options);
    }
docs: Delete an entity by ID.
  
  @param entityClass Entity class.
  @param id Entity id.
  @param options Options.
  @return An empty listenable future.