[Question] whats mean about this todo(ThreadLocal)

### Problem Type (问题类型)

rest-api (结果不合预期)

### Before submit

- [X] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

### Environment (环境信息)

- apache 1.2.0
- windows
- auth mode

### Your Question (问题描述)

do you have any context info about this todo? @javeme (link the code below)

https://github.com/apache/incubator-hugegraph/blob/1d4532cd62f9b10e2ef8648047107ae0fd5ca808/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/auth/HugeAuthenticator.java#L108