docs: private List<Future> doBatchLoad(List<Data> keys) {
          Queue<List<Data>> batchChunks = createBatchChunks(keys);
          int size = batchChunks.size();
          List<Future> futures = new ArrayList<>(size);
  
          while (!batchChunks.isEmpty()) {
              List<Data> chunk = batchChunks.poll();
              List<Data> keyValueSequence = loadAndGet(chunk);
              if (keyValueSequence.isEmpty()) {
                  continue;
              }
              futures.add(sendOperation(keyValueSequence));
          }
  
          return futures;
      }