mong模板聚合匹配和投影一个字段，没有id

Question

如何运行具有匹配和投影的聚合。投影包括一个字段并排除 id。db.collection("Collection").aggregate([    {        $match : {            "someCriteriaFlag" : false        }    },    {        $project : {            "field1" : 1,            "_id" : 0        }    }]);在爪哇Aggregation aggregation = Aggregation.newAggregation(        Aggregation.match(Criteria.where("someCriteriaFlag").is(false)),         Aggregation.project("field1"));List<String> fields= mongoTemplate.aggregate(aggregation, "Collection", BasicDBObject.class)        .getMappedResults();

Answer 1

Aggregation aggregation = Aggregation.newAggregation(
    Aggregation.match(Criteria.where("someCriteriaFlag").is(false)), 
    Aggregation.project("field1").andExclude("_id"));

List<String> fields= mongoTemplate.aggregate(aggregation, "Collection", BasicDBObject.class)
    .getMappedResults();