docs: @PublicEvolving
  	public <R> SingleOutputStreamOperator<R> process(ProcessFunction<T, R> processFunction) {
  
  		TypeInformation<R> outType = TypeExtractor.getUnaryOperatorReturnType(
  			processFunction,
  			ProcessFunction.class,
  			0,
  			1,
  			TypeExtractor.NO_INDEX,
  			getType(),
  			Utils.getCallLocationName(),
  			true);
  
  		return process(processFunction, outType);
  	}