[{id:123,contactsOfAppUsers:[{id:"abc",contactsArray:["9999911111","9999922222"]},{id:"efg",contactsArray:["9999933333","9999944444"]},{id:"hij",contactsArray:["9999955555","9999933333"]}]}]

db.collection.aggregate({$project:{id:1,_id:0,matchingObjects:{$filter:{input:"$contactsOfAppUsers",as:"numbers",cond:{$in:["9999933333","$$numbers.contactsArray"]}}}}})