I am trying to update one key value in a nested object in MongoDB. currently, the way I am doing it the entire nested object is being overwritten, how can I change one key-value pair?

  try {
      Files.updateOne(
        { _id: document._id },
        {a:{b:{c:"new text", d: "not to change"}}},
        function (err, result) {
          if (err) {
            res.send(err);
          } else {
            res.send(result);
          }
        }
      );
    } catch (err) {
      res.status(400).send(err);
    }