MongoDB中关于查询条件中包含集合中字段的查询

Criteria criteria1 = Criteria.where("validStartTime").gt(new Date()).
	and("versionLimitList").elemMatch
	(Criteria.where("clientId").is(109).
	and("platFormCode").is(2);

{
 "validStartTime": {
 "$gt": ISODate("2014-11-01T10:33:09.661Z")
 },
 "versionLimitList": {
 "$elemMatch": {
 "clientId": 109,
 "platFormCode": 2
 }
 }
}

db.systemInfo211.find({ "validStartTime" : { "$gt" : ISODate("2014-11-01T10:33:09.661Z") }, 
"versionLimitList" : { "$elemMatch" : { "clientId" : 109, "platFormCode" : 2 } } }).limit(50);