I'm trying to filter a custom post type (Projects) using a text-based search field. I would like the filter to look at the relationship fields of the Project. In this case, a Project custom post type has a many to many relationship with the custom post type People.
For example, on hidden link, if someone searches "John", all the Projects that have a relationship with John should show up in the search results.
Is this possible? If not, is there an alternative solution?