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You need to put the CategorySelector value into the Category property using the Saving event.
An easier option could be to add a new CategoryList property where you just convert the CategorySelector-value to a correct list item.
Hello,
Background
Approach
With the IncludeField method, I would like to update the inbuilt property "Category" from the custom property "CategorySelector" at the FIND index ,so that the list pages can fetch the pages from FIND based upon buiild in Category property.
The Index at FIND should not be empty for Category property
Ref:
EPiServer.Find.Framework.SearchClient.Instance.Conventions.ForInstancesOf().IncludeField()
Thanks,
Amol Mahul