Sailsjs 1.0 and mongo adapter aggregate query

Question

I'm trying to perform an aggregate query that uses the $dateToString aggregation function but whenever I execute it i get the following error:

can't convert from BSON type string to Date

Note that if I execute the query through any client the query perfectly answers with expected result: a counter for each day.

My code is the following:

getResultsDashboard: async function (req, res) {
    var db = myTestCollection.getDatastore().manager;
    var rawmyTestCollection = db.collection(myTestCollection.tableName);

    let aggregateQuery = [
      {
        $match: { field1: "myValue" },
      },
      {
        $group: {
          _id: { $dateToString: { format: "%Y-%m-%d", date: "$createdAt" } },
          count: { $sum: 1 },
        },
      },
      {
        $sort: { _id: -1 },
      },
    ];

    let resultsByDate = await rawmyTestCollection.aggregate(aggregateQuery).toArray();

    return res.json(resultsByDate);
  }

I've also tried with native instead

    myTestCollection.native((err, coll) => {
      coll.aggregate(aggregateQuery).toArray((err2, result) => console.log(result));
    });

But no results, only a message of deprecation for the native method.

I guess it is the driver for mongo. Is there any other driver for sails? Or how can I implement the query in other way? Except, of course, getting from the db all the dates and then performing all the aggregation in javascript.