"Index of" searches are almost exclusively used to locate pirated content. Download a movie from an open directory is a direct copyright infringement. Unlike torrenting, which relies on a swarm of users, downloading from an index is a direct server-to-client transfer, which can be easier for ISPs to track (though it happens less frequently now due to the obscurity of the method).
Technically, this is not a specific website but a or search operator. When a server is not configured correctly, it displays a raw list of files—an "index"—rather than a formatted webpage. By searching for "index of" , users can filter Google results to show only these open, unguarded directories. index of movies bollywood