Spring Data MongoDB:如何使用Spring Aggregation来描述聚合$merge？

import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.beans.factory.annotation.Autowired;

public class ExampleClass {
    @Autowired
    private MongoTemplate mongoTemplate;

    public void mergeAggregationExample() {
        Aggregation aggregation = Aggregation.newAggregation(
            Aggregation.match(/* 过滤条件 */),
            Aggregation.group(/* 分组字段 */),
            Aggregation.sort(/* 排序字段 */),
            Aggregation.merge().into("targetCollection") // 指定目标集合的名称
                .on(/* 合并条件 */)
                .whenMatched(/* 相匹配的情况下的合并选项 */)
                .whenNotMatched(/* 未匹配的情况下的合并选项 */)
        );

        AggregationResults<YourResultClass> result = mongoTemplate.aggregate(aggregation, "sourceCollection", YourResultClass.class);
        // 对聚合结果进行处理
    }
}