How to make a content item used as 404 page, or any other item, to be unsearchable
- it is good to make item state to be Archived
- For Search view
-- in your search MENU item (search module also requires a menu item, and uses it for configuration)
do not add the content type of the item to searchable types - For category-like views that also have text search
-- assign the item to a category that you have configured to be non-linkable (* see below)
and also make sure the category is top level (no parent) and it has no direct menu items to it
(*) go to FLEXIcontent Advance Route plugin and select not to create links to the category
