code: function addReconnectOnReadonly(cfg) {
    const noop = () => false;
    const userReconn = (typeof cfg.reconnectOnError === 'function') ? cfg.reconnectOnError : noop;
    cfg.reconnectOnError = err => {
      const shouldReconnect = (isReadonlyError(err) || userReconn(err)) ? 2 : false;
      if (shouldReconnect) console.warn(RECONNECT_WARNING);
      return shouldReconnect;
    };
  }
docs: This is necessary for the store to handle the case when
  another master is selected in ElastiCache, while
  connecting to the Primary Endpoint.
  
  @see https://github.com/dowjones/distribucache-redis-store/issues/3
  @see https://github.com/luin/ioredis#reconnect-on-error