[{"_id":1,"solved":"Clipbot","horario":0},{"_id":2,"solved":"Clipbot","horario":1},{"_id":3,"solved":"Agent","horario":0},{"_id":4,"solved":"Agent","horario":1},{"_id":5,"solved":"Clipbot","horario":0},{"_id":6,"solved":"Clipbot","horario":1},{"_id":7,"solved":"Agent","horario":0},{"_id":8,"solved":"Agent","horario":1},]

db.collection.aggregate([{$group:{_id:{solved:"$solved",horario:"$horario"},count:{$sum:1},solved:{$first:"$solved"},horario:{$first:"$horario"}}},{$project:{_id:0}}])