docs: public void process(List<T> objects, boolean sync) {
          for (T message : objects) {
              // If this batcher has been shutdown, do not accept any more
              // messages
              if (isShutDown) {
                  return;
              }
              if (sync) {
                  processSync(message);
              } else {
                  process(message);
              }
          }
      }