: Sent to market to sell his uncle’s horse, Jack meets a monk who trades him a pouch of "sacred" beans for the animal. He is warned strictly never to get them wet. The Gateway : That night, Princess Isabelle

The term in your request likely refers to the "paper" used in the film's intro or the literary origins of the story:

In the digital underworld of the early 2010s, "Index Of" was the skeleton key to the kingdom. No flashy ads, no "Hot Singles in Your Area," just the raw, cold directory of a server that someone, somewhere, had forgotten to lock.