如何在Spring Mongo数据聚合中使用DateOperators

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

@Configuration
public class MongoConfig {

    @Bean
    public MongoTemplate mongoTemplate(MongoDbFactory mongoDbFactory, MappingMongoConverter mappingMongoConverter) {
        return new MongoTemplate(mongoDbFactory, mappingMongoConverter);
    }
}

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

Aggregation aggregation = Aggregation.newAggregation(
    project("field1", "field2")
        .and(dateOf("dateField")).as("formattedDate"),
    group("formattedDate")
        .count().as("count")
);

AggregationResults<AggregationResult> results = mongoTemplate.aggregate(aggregation, "collectionName", AggregationResult.class);
List<AggregationResult> aggregationResults = results.getMappedResults();