我查询mongodb数据有问题。文件如下：

{
   productId:1,
   warehouses:[
             warehouseId:1,
             productBatch:[
                          {
                            unitPrice:15.5,
                            quantity:1000,
                            expireSearchTimestamp:14145555545,
                            currentQuantity:50
                          },{
                            unitPrice:17.5,
                            quantity:1000,
                            expireSearchTimestamp:14145555545,
                            currentQuantity:50
                          }
               ]
          ]
}

代码是

public List<ProductSearchResult> findCustomSearch(List<Integer> medicines,
            List<Integer> warehousesIds, int quantity)
    {
        UnwindOperation unwind1 = Aggregation.unwind("warehouses");
        UnwindOperation unwind2 = Aggregation.unwind("warehouses.productBatch");
        ProjectionOperation project = Aggregation.project("warehouses.productBatch");
        MatchOperation match = Aggregation.match(Criteria.where("productId").in(productIds)
                .and("warehouses.warehouseId").in(warehousesIds)
                .and("warehouses.productBatch.currentQuantity").gte(quantity));
        SortOperation sort = Aggregation.sort(Direction.ASC, "productBatch.unitPrice");
        LimitOperation limit = Aggregation.limit(3);
        Aggregation aggregation = Aggregation
                .newAggregation(unwind1, unwind2, project, sort, limit)
                .withOptions(Aggregation.newAggregationOptions().allowDiskUse(true).explain(true)
                        .cursor(new BasicDBObject()).build());
            AggregationResults<ProductSearchResult> results = mongoTemplate.aggregate(aggregation,
                    "medicine", ProductSearchResult.class);
            List<ProductSearchResult> mappedResults = results.getMappedResults();
            return mappedResults;
        }

这是函数输出

[
    {
        "$unwind": "$warehouses"
    },
    {
        "$unwind": "$warehouses.productBatch"
    },
    {
        "$match": {
            "productId": {
                "$in": [
                    20,
                    21
                ]
            },
            "warehouses.warehouse_id": {
                "$in": [
                    1,
                    2,
                    3,
                    4,
                    5
                ]
            },
            "warehouses.productBatch.currentQuantity": {
                "$gte": 10
            }
        }
    },
    {
        "$project": {
            "medicine_search": "$warehouses.productBatch"
        }
    },
    {
        "$sort": {
            "productBatch.unitPrice": 1
        }
    },
    {
        "$limit": 3
    }
]

当我运行这个函数时，我得到了空列表，但是根据mongo compass，我得到了3个元素。
谢谢