code: public void getBytes(int index, Slice dst, int dstIndex, int length)
      {
          getBytes(index, dst.data, dstIndex, length);
      }
docs: Transfers this buffer's data to the specified destination starting at
  the specified absolute {@code index}.
  
  @param dstIndex the first index of the destination
  @param length the number of bytes to transfer
  @throws IndexOutOfBoundsException if the specified {@code index} is less than {@code 0},
  if the specified {@code dstIndex} is less than {@code 0},
  if {@code index + length} is greater than
  {@code this.capacity}, or
  if {@code dstIndex + length} is greater than
  {@code dst.capacity}