JAVA使用MongoTemplate聚合函数分组并排序

    public List> calculationGroupOfText(String code){
        Aggregation agg = Aggregation.newAggregation(Aggregation.match(Criteria.where("key").is("value").and(code).ne(null)),
                Aggregation.group(code)
                .first(code).as("name")
                .count()
                .as("num"),
                Aggregation.sort(Sort.Direction.DESC,"num"),
                Aggregation.limit(5));
        AggregationResults