code: def _batched_write_command(
          namespace, operation, command, docs, check_keys, opts, ctx):
      
      buf = StringIO()
  
      # Save space for message length and request id
      buf.write(_ZERO_64)
      # responseTo, opCode
      buf.write(b"\x00\x00\x00\x00\xd4\x07\x00\x00")
  
      # Write OP_QUERY write command
      to_send, length = _batched_write_command_impl(
          namespace, operation, command, docs, check_keys, opts, ctx, buf)
  
      # Header - request id and message length
      buf.seek(4)
      request_id = _randint()
      buf.write(_pack_int(request_id))
      buf.seek(0)
      buf.write(_pack_int(length))
  
      return request_id, buf.getvalue(), to_send
docs: Create the next batched insert, update, or delete command.