{

    "data": [
        {
            "_id": 366,

            "logs": [
                {
                    "id": 113,
                    "booking_id": 366,
                    "provider_id": 13,
                    "cid": 11,
                    "type": "basic",
                    "time": 1542793756,
                },
                {
                    "id": 116,
                    "booking_id": 366,
                    "provider_id": 13,
                    "cid": 0,
                    "type": "type2",
                },


            ],
        },
        {
            "_id": 362,

            "logs": [
                {
                    "id": 104,
                    "booking_id": 362,
                    "provider_id": 7,
                    "cid": 10,
                    "type": "basic",
                    "time": 1542776677,
                }
            ],
        },

        {
            "_id": 370,

            "logs": [
                {
                    "id": 111,
                    "booking_id": 370,
                    "provider_id": 9,
                    "cid": 11,
                    "type": "basic",
                    "time": 1542792661,
                ]
                {
                    "id": 112,
                    "booking_id": 370,
                    "provider_id": 11,
                    "cid": 11,
                    "type": "basic",
                    "time": 1542793185,
                }
            ],
        "total_record": 2
    }

"total_record":3

query := []bson.M{
        {"$group": bson.M{
        "_id":  "$booking_id",
        "logs": bson.M{ "$push": "$$ROOT" }
        "count": bson.M{"$sum":1},
        }},
    }

    pipe := getCollection.Pipe(query)
    err = pipe.AllowDiskUse().One(&result)