I am working in SP2013 , created a new custom user profile property with Type Booolen. once search people crawl is completed i can able to see that field in Crawled properties.After that i created a managed property in Search service application at Central Admin and mapped the property. again ran the full search people crawl once completed .i went to the site and try to query the values but unable to see the managed property field in the property filter as per below screen shot.
Be sure that for the Managed Property, under the Advanced button, you select the PeopleIdx. Otherwise the field will not be associated with People.