def set_touch(policy, key)
      begin_cmd
      field_count = estimate_key_size(key)
      estimate_operation_size
      size_buffer
      write_header_with_policy(policy, 0, INFO2_WRITE, field_count, 1)
      write_key(key)
      write_operation_for_operation_type(Aerospike::Operation::TOUCH)
      end_cmd
    end
def set_touch(policy, key)
      begin_cmd
      field_count = estimate_key_size(key)
      estimate_operation_size
      size_buffer
      write_header_with_policy(policy, 0, INFO2_WRITE, field_count, 1)
      write_key(key)
      write_operation_for_operation_type(Aerospike::Operation::TOUCH)
      end_cmd
    end
Writes the command for touch operations