code: function _connectionFailureHandler(self) {
        return function() {
          if (this._connectionFailHandled) return;
          this._connectionFailHandled = true;
          // Destroy the connection
          this.destroy();
          // Count down the number of reconnects
          self.retriesLeft = self.retriesLeft - 1;
          // How many retries are left
          if (self.retriesLeft <= 0) {
            // Destroy the instance
            self.destroy();
            // Emit close event
            self.emit(
              'reconnectFailed',
              new MongoNetworkError(
                f(
                  'failed to reconnect after %s attempts with interval %s ms',
                  self.options.reconnectTries,
                  self.options.reconnectInterval
                )
              )
            );
          } else {
            self.reconnectId = setTimeout(attemptReconnect(self), self.options.reconnectInterval);
          }
        };
      }
docs: If we have failure schedule a retry