[{"_id":ObjectId("5e33c4daa855df1587760621"),"shop":"Q4","batch":["5647"]},{"_id":ObjectId("5e33c4daa855df1587760622"),"shop":"Q4","batch":["2314","0121"]},{"_id":ObjectId("5e33c4daa855df1587760623"),"shop":"Q1","batch":["5647"]},{"_id":ObjectId("5e33c4daa855df1587760624"),"shop":"Q1","batch":[]},{"_id":ObjectId("5e33c8fca855df1587760625"),"shop":"Q5","batch":["5647"]},{"_id":ObjectId("5e33c8fca855df1587760626"),"shop":"Q5","batch":["5647"]},{"_id":ObjectId("5e33c907a855df1587760627"),"shop":"Q6","batch":[]},{"_id":ObjectId("5e33c907a855df1587760628"),"shop":"Q6","batch":["5647"]},{"_id":ObjectId("5e33c90ea855df1587760629"),"shop":"Q7","batch":[]},{"_id":ObjectId("5e33c90ea855df158776062a"),"shop":"Q8","batch":["5647"]},{"_id":ObjectId("5e33db9b7f8bc30a75fd1a26"),"shop":"Q1","batch":[]}]

db.collection.aggregate([{$group:{_id:"",shop:{$addToSet:"$shop"},emptyBatchShops:{$push:{$cond:[{$eq:["$batch",[]]},"$shop",null]}}}},{$project:{_id:0,uniques:{$setDifference:["$shop","$emptyBatchShops"]}}}])