[8.x] [DOCS] Add minimal synthetic APIs (elastic#214518) (elastic#217901)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[DOCS] Add minimal synthetic APIs
(elastic#214518)](elastic#214518)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

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Add minimal synthetic APIs (elastic#214518)\n\nCo-authored-by: Colleen McGinnis
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Add minimal synthetic
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Add minimal synthetic APIs (elastic#214518)\n\nCo-authored-by: Colleen McGinnis
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BACKPORT-->

---------

Co-authored-by: kibanamachine <[email protected]>

Author: lcawl