code: def _default_stage_name_calculator(self, prefix, existing_stage_names):
      
      index = 1
      calculated_name = ""
      while True:
        calculated_name = prefix + "-" + str(index)
        if calculated_name not in existing_stage_names:
          return calculated_name
        index = index + 1
      return "Should Never Got Here"
docs: This is the method that's implemented by the operators to get the name of the Streamlet
      :return: The name of the operator