this.index = index;
    }

    abstract S createSplit(F from, long i);

    @Override
    public @Nullable S trySplit() {
      Spliterator<?> splitOrNull = fromSpliterator.trySplit();
      if (splitOrNull == null) {
        return null;
      }
      @SuppressWarnings("unchecked")
      F split = (F) splitOrNull;
      S result = createSplit(split, index);
      this.index += split.getExactSizeIfKnown();

    public BulkRequestBuilder prepareBulk(final String globalIndex) {
        return client.prepareBulk(globalIndex);
    }

    @Override
    public void createPit(final CreatePitRequest createPITRequest, final ActionListener<CreatePitResponse> listener) {
        client.createPit(createPITRequest, listener);
    }

    @Override