docs: function getAdminDbUrl(mongoConnectionString, formUser, poolSize) {
    var parsedMongoUrl = mongoUrlParser.parse(mongoConnectionString);
    parsedMongoUrl.username = formUser.user;
    parsedMongoUrl.password = formUser.pass;
    //according to this: https://docs.mongodb.com/v2.4/reference/user-privileges/#any-database-roles, this type of user should be created in the `admin` database.
    parsedMongoUrl.database = "admin";
    parsedMongoUrl.options = parsedMongoUrl.options || {};
    parsedMongoUrl.options.poolSize = poolSize || MONGODB_DEFAULT_POOL_SIZE;
    var mongourl = mongoUrlParser.format(parsedMongoUrl);
    return mongourl;
  }