> For the complete documentation index, see [llms.txt](https://liuzhenglaichn.gitbook.io/system-design/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://liuzhenglaichn.gitbook.io/system-design/todo-1.md).

# TODO

- [TODO](https://liuzhenglaichn.gitbook.io/system-design/todo-1/todo.md)
- [Elastic Search](https://liuzhenglaichn.gitbook.io/system-design/todo-1/elastic-search.md)
- [Lucene](https://liuzhenglaichn.gitbook.io/system-design/todo-1/lucene.md)
- [twitter-snowflake](https://liuzhenglaichn.gitbook.io/system-design/todo-1/twitter-snowflake.md)