When i created the page selector field in the page type "BlogPost" it saves the treenode ID into the database, so i created a function to retrieve the name of the page so i can display it as the author of the blogpost.
After i made this question i tried to search for the treenode ID and it works, but not the name.
About your question, in the search field settings the "page selector" item has Content, Searchable and Tokenized activated.