code: func (h *BytesRefHash) ByteStart(bytesId int) int {
  	assert2(h.bytesStart != nil, "bytesStart is null - not initialized")
  	assert2(bytesId >= 0 && bytesId <= h.count, "%v", bytesId)
  	return h.bytesStart[bytesId]
  }
docs: /*
  Returns the bytesStart offset into the internally used ByteBlockPool
  for the given bytesID.
  */