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db.collection.aggregate([{$unwind:"$batch"},{$group:{_id:"$batch",count:{$sum:"$jobs"}}},{$group:{_id:"",data:{$push:"$$ROOT"}}},{$addFields:{value:{$filter:{input:"$data",as:"e",cond:{$eq:["$$e._id","0"]}}}}},{$project:{_id:0,data:{$filter:{input:{$map:{input:"$data",as:"e",in:{$subtract:[{$arrayElemAt:["$value.count",0]},"$$e.count"]}}},as:"e",cond:{$ne:["$$e",0]}}}}}])