datax elasticsearchwriter 是否支持 SSL TLS 加密

Elastic 在默认分发包上[提供了TLS认证加密的功能](https://www.elastic.co/cn/blog/configuring-ssl-tls-and-https-to-secure-elasticsearch-kibana-beats-and-logstash)，而且使用用户认证安全模块要求必须启用TLS加密，但是没有看到DATAX的[elasticsearchwriter中具备TLS证书相关选项](https://github.com/alibaba/DataX/blob/master/elasticsearchwriter/doc/elasticsearchwriter.md)，请问 elasticsearchwriter 插件是否支持访问添加了SSL TLS加密的elasticsearch服务？

Start with elasticsearchwriter/doc/elasticsearchwriter.md and inspect the Elasticsearch writer plugin entry points to determine how connections are configured. Check whether TLS options are supported and whether tests or configuration examples cover them; done means the support status and required settings are documented or the missing capability is clearly scoped.

Written by the indexing model from the issue text.