elasticsearchwriter认证问题

如果es server端配置了匿名用户，elasticsearchwriter中配置的accessId、accessKey则会用不到，所有操作仍然以匿名的方式进行，由于匿名一般设置的权限比较小，所以向es写数据就失败了。如果去掉es server中配置的匿名用户，accessId、accessKey配置的用户和密码就能用到了，可以正常向es写数据。请问这是bug吗？

Start at the elasticsearchwriter entry point and reproduce the reported behavior with an Elasticsearch server configured for anonymous access. Check whether the configured accessId and accessKey are honored in that setup; done means authenticated writes succeed without removing the server's anonymous-user configuration.

Written by the indexing model from the issue text.