code: function getMongooseConnection(mongoDbUrl, logger, cb) {
    logger.debug("creating mongoose connection for data_source_update job", {mongoDbUrl: mongoDbUrl});
    var mongooseConnection = mongoose.createConnection(mongoDbUrl);
    return cb(undefined, mongooseConnection);
  }
docs: Create a new mongoose connection.
  @param {string} mongoDbUrl the url to connect to the mongodb database
  @param {object} logger
  @param {function} cb the callback function