[{mlsId:"RTC749",firstName:"Tommy",lastName:"Davidson",officeMlsId:"RTC2421",officeName:"John Jones Real Estate LLC",slug:"tommy-davidson",serviceAreas:[{name:"Nashville",slug:"nashville",type:"city",totalClosedSales:3},{name:"Franklin",slug:"franklin",type:"city",totalClosedSales:7}]},{mlsId:"RTC7280",firstName:"Jack",lastName:"Miller",slug:"jack-miller",serviceAreas:[{name:"Nashville",slug:"nashville",type:"city",totalClosedSales:4},{name:"Franklin",slug:"franklin",type:"city",totalClosedSales:10}]}]

db.collection.aggregate([{"$match":{"serviceAreas.slug":"nashville"}},{$unwind:"$serviceAreas"},{$sort:{"serviceAreas.totalClosedSales":-1}},{$addFields:{total:"$serviceAreas.totalClosedSales"}},{$sort:{total:-1}},{$group:{_id:"$_id",mlsId:{$first:"$mlsId"},firstName:{$first:"$firstName"},lastName:{$first:"$lastName"},slug:{$first:"$slug"},serviceAreas:{$push:"$serviceAreas"}}}])