code: @Override
      public Future<?> loadValues(List<Data> keys, boolean replaceExistingValues) {
          Callable task = new GivenKeysLoaderTask(keys, replaceExistingValues);
          return executeTask(MAP_LOADER_EXECUTOR, task);
      }
docs: {@inheritDoc}
  <p>
  Offloads the value loading task to the
  {@link ExecutionService#MAP_LOADER_EXECUTOR} executor.