Database
[{_id:ObjectId("5a934e000102030405000000"),Vehicles:[{Manufacturer:"Chevrolet",color:"blue"},{Manufacturer:"Nissan",color:"blue"},{Manufacturer:"Hyundai",color:"blue"},{Manufacturer:"Nissan",color:"blue"},{Manufacturer:"FORD",color:"blue"},{Manufacturer:"FORD",color:"blue"}],}]
Query
db.collection.aggregate([{$unwind:"$Vehicles"},{$group:{_id:"$Vehicles.Manufacturer",count:{$sum:1}}},{$group:{_id:0,unfiltered_makes:{$push:"$$ROOT"},makes:{$push:{$cond:[{$eq:["$_id","FORD"]},"$$ROOT","$$REMOVE"]}}}}])