> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# App Studio 4.0.0 Release Notes

[localhost link]: http://localhost:3000/docs/4/app-studio/release-notes/4.0.0-release-notes

[mintlify link]: https://doc.lucidworks.com/docs/4/app-studio/release-notes/4.0.0-release-notes

[old doc.lw link]: https://doc.lucidworks.com/app-studio/4.2/970

**Release date:** 28 June 2018

This is the first public release of App Studio, compatible with Fusion Server 4.0.

## Known issues

* Due to a known issue in Fusion Server 4.0.2, not all potential facet fields are not listed on the "Set Facets and Additional Fields" screen of the App Studio setup wizard.

  *Workaround:*

  In the [Query Workbench](/docs/4/fusion-server/concepts/querying/query-workbench), use the [Field Facet query pipeline stage](/docs/4/fusion-server/reference/pipeline-stages/query/facet-query-stage) to add the desired facet field to the pipeline.