# Backport
This will backport the following commits from `main` to `8.x`:
- [Enhance documentation on accessing hidden SO types
(#199046)](https://github.com/elastic/kibana/pull/199046)
<!--- Backport version: 9.4.3 -->
### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)
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Co-authored-by: Christiane (Tina) Heiligers <christiane.heiligers@elastic.co>
## Summary
Added documentation explaining how SO migrations on serverless work
## Preview
<img width="741" alt="Screenshot 2024-03-22 at 16 15 13"
src="2217c01f-8447-4f22-a782-a07ff221aa42">
* Add deferred migrations parameter.
* Update outdated documents query to take into account deferred migrations.
* Update outdated documents query to take into account the core migration version.
* Update read operations in the saved objects repository to perform deferred migrations.
* Update the slugs to improve google analytics drilldown tracking
* more slug updates
* Fix some formatting issues in building blocks
* update paths
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>
