Hi!
I am back. After some looking around and examining the source code I have found the custom fields. They have a very generic title scheme, basically all custom made text, checkbox and other fields are stored as “_custom-checkbox-1”, “_custom-text-1” etc.. so it was not trivial to find them. It is impossible to tell which one is which, but it does not matter much, I selected everything I could find for indexing.
The keyword count went up greatly, the values are nicely stored in the fields, so they are searchable.
Now in case you create more search engines, then make sure to select the index table engine, and you are good to go.
