并非所有mongodb语法都受 Spring Mongo ，所以我们需要实施 AggregationOperation 手动（java>= v1.8 ):

import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;
import static org.springframework.data.mongodb.core.query.Criteria.*;
import static org.springframework.data.mongodb.core.aggregation.DateOperators.*;

Aggregation agg = newAggregation(
    op -> new Document("$group",
        new Document("_id",
            new Document("day", new Document("$dayOfMonth", "$createdAt"))
                .append( "month", new Document("$month", "$createdAt"))
                .append( "year", new Document("$year", "$createdAt")))
        .append("count", new Document("$sum", 1))
        .append("date", new Document("$first", "$createdAt"))),
    project("count")
        .andExclude("_id")
        .and(dateOf("date").toString("%Y-%m-%d")).as("date"),
    match(where("date").gte("2020-06-05")));

AggregationResults<OutputClass> result = mongoTemplate.aggregate(agg,
    mongoTemplate.getCollectionName(BillingDomain.class), OutputClass.class);

编辑： System.out.println(agg); ```
{
"aggregate":"collection",
"pipeline":[
{
"$group":{
"_id":{
"day":{
"$dayOfMonth":"$createdAt"
},
"month":{
"$month":"$createdAt"
},
"year":{
"$year":"$createdAt"
}
},
"count":{
"$sum":1
},
"date":{
"$first":"$createdAt"
}
}
},
{
"$project":{
"count":1,
"_id":0,
"date":{
"$dateToString":{
"format":"%Y-%m-%d",
"date":"$date"
}
}
}
},
{
"$match":{
"date":{
"$gte":"2020-06-05"
}
}
}
]
}