Viacom18 Studios has an official YouTube channel. You can rent or purchase Kahaani legally on YouTube. This is the closest legal experience to an "index of" download, as you can download the video for offline viewing within the YouTube app.
Open directories are unverified. The file labeled "Kahaani.1080p.BluRay.x264" could be: index of kahaani
Depending on your region, Kahaani is often available on Netflix. It includes the original audio, high bitrate video, and professional multi-language subtitles. Viacom18 Studios has an official YouTube channel
If you’re looking for a technical guide to creating an index of a folder named kahaani (like index of /kahaani on a web server), here’s a long guide: high bitrate video