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db.collection.aggregate([{$addFields:{month:{$month:{$dateFromString:{dateString:"$date"}}}}},{$addFields:{month:{$let:{vars:{monthsInString:["","january","february","march","april","may","june","july","august","september","october","november","december"]},in:{$arrayElemAt:["$$monthsInString","$month"]}}}}},{$group:{_id:"$month",data:{$push:"$$ROOT"}}},{$project:{"data.month":0}}])