# Page Not Found

The URL `manual-zh/core/single-purpose-aggregation.html` does not exist.

You might be looking for one of these pages:
- [Map-Reduce转换到聚合管道](https://docs.mongoing.com/aggregation/map-reduce/map-reduce-to-aggregation-pipeline.md)
- [集合管道中的文本索引](https://docs.mongoing.com/mongodb-crud-operations/text-search/text-search-in-the-aggregation-pipeline.md)
- [聚合管道更新](https://docs.mongoing.com/mongodb-crud-operations/update-documents/updates-with-aggregation-pipeline.md)
- [$convert (aggregation)](https://docs.mongoing.com/can-kao/yun-suan-fu/aggregation-pipeline-operators/convert-aggregation.md)
- [$literal (aggregation)](https://docs.mongoing.com/can-kao/yun-suan-fu/aggregation-pipeline-operators/literal-aggregation.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.mongoing.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.mongoing.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/aggregation/map-reduce/map-reduce-to-aggregation-pipeline.md`)
- Use `Accept: text/markdown` header for content negotiation