Mongoose async/await find então edite e salve?

try {
    var accounts = await Account.findOneAndUpdate(
        {"username" : "[email protected]"},
        {$set: {"password" : "aaaa"}},
        {new : true}
    );
    res.status(200).json(accounts);
} catch (error) {
    handleError(res, error.message);
}

try {
    var accounts = await Account.findOne()
    .where("username").in(["[email protected]"])
    .exec();
    accounts.password = 'asdf';
    accounts.save();
    res.status(200).json(accounts);
} catch (error) {
    handleError(res, error.message);
}