mongo聚合：-使用Spring推送所有字段

import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;
import org.springframework.data.mongodb.core.aggregation.TypedAggregation;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import java.util.List;

public class AggregationExample {

    private final MongoTemplate mongoTemplate;

    public AggregationExample(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    public List<YourEntity> pushAllFields() {
        TypedAggregation<YourEntity> aggregation = Aggregation.newAggregation(
                YourEntity.class,
                Aggregation.match(Criteria.where("yourField").exists(true)),
                Aggregation.project().andExclude("_id").andInclude("$$ROOT")
        );

        AggregationResults<YourEntity> results = mongoTemplate.aggregate(aggregation, YourEntity.class);
        return results.getMappedResults();
    }
}