elasticsearchwriter的aliasMode参数不支持es6以上版本

aliasMode设置为exclusive时，elasticsearchwriter会先查出当前别名关联的索引，然后一一删除。
但是代码中使用GET /{alias_name}/aliases 获取别名下的所有索引：见jest-common:2.4.0中类GetAliases.class22行super.buildURI() + "/_aliases"；这种方式elasticsearch6已经不支持了，建议使用GET /*/_alias/{alias_name}。

Start at jest-common:2.4.0's GetAliases.class, especially line 22, and trace the elasticsearchwriter aliasMode=exclusive path that queries the current alias indices. Verify the alias lookup against Elasticsearch 6+ behavior and confirm it still supports the subsequent index deletion flow.

Written by the indexing model from the issue text.