F4: (Meta)data are registered or indexed in a searchable resource

Increasing leverage: the ratio of machine action to user action. Indexing as leverage via sorting.
The goal here is leverage: increasing the ratio of machine action to user action in getting to the data that they want. Otherwise, your data is technically findable, but it's going to require a lot of user action. They might have to do a full data download, scan through a full table, scroll through a long webpage, and it's unlikely that they're going to actually find what they need, because they're just not going to put in that much effort. So you really want indexing. You want this leverage to have your machine help do some of the action that a user might otherwise do.