[{_id:"1",name:"John Doe",age:25,address:{street:"123 Main St",city:"New York",state:"NY",zip:"10001"},images:[{url:"http://www.example.com/image1.jpg",caption:"Image 1",type:"jpg"},{url:"http://www.example.com/image2.jpg",caption:"Image 2",type:"png"},{url:"http://www.example.com/image3.jpg",caption:"Image 3",type:"svg"},{url:"http://www.example.com/image4.jpg",caption:"Image 4",type:"jpg"}]},{_id:"2",name:"Jack",age:22,address:{street:"132 lake",city:"New York",state:"NY",zip:"10001"},images:[{url:"http://www.example.com/image212.jpg",caption:"Image 212",type:"png"},{url:"http://www.example.com/image34.jpg",caption:"Image 34",type:"svg"}]},{_id:"3",name:"Random name",age:27,address:{street:"Lajpat nagar",city:"New Delhi",state:"Delhi",zip:"121002"},images:[{url:"http://www.example.com/image5.jpg",caption:"Image 5",type:"jpg"},{url:"http://www.example.com/image7.jpg",caption:"Image 7",type:"png"},{url:"http://www.example.com/image12.jpg",caption:"Image 12",type:"svg"},{url:"http://www.example.com/image8.jpg",caption:"Image 8",type:"jpg"}]}]

db.collection.aggregate([{$match:{$expr:{"$gte":[{$size:{"$filter":{"input":"$images","as":"img","cond":{"$eq":["$$img.type","jpg"]}}}},1]}}},{"$count":"res"},])