在文档mongoDB springboot中的对象列表中查找最大时间戳

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Repository;

@Repository
public class MyRepository {

    private final MongoTemplate mongoTemplate;

    @Autowired
    public MyRepository(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    public long findMaxTimestamp() {
        Query query = new Query();
        query.with(Sort.by(Sort.Direction.DESC, "timestamp")).limit(1);
        MyObject result = mongoTemplate.findOne(query, MyObject.class);
        if (result != null) {
            return result.getTimestamp();
        }
        return 0;
    }
}