Full text search for content available on the following pages of the object definition:
Documentation pages and sub pages (both for structured and unstructured documentation)
https://docs.automic.com/documentation/webhelp/english/ALL/components/DOCU/21.0.4/Automic%20Automation%20Guides/Content/_Common/CommonFunctions/CF_AdvancedSearch.htm?Highlight=Advanced%20Search
In the case the documentation content is located in Doku (vs Docu), the advanced search is unable to find it.
It does not matter if the Page "Doku" is defined in UC_OBJECT_DOCU, the content is not detected.
AE 12.3 and 21.0.4
This is a defect of the Automation Engine
This bug is fixed, and the fix will come in version 21.0.6 of the Automation Engine
A problem has been fixed where the advanced content search failed for queries targeting user defined documentation sub pages defined in UC_OBJECT_DOCU