This project has moved to Planet Minecraft.
This data pack brings shulker boxes to the early game by making Endermen drop chorus fruit, and adding a recipe for shulker shells from popped chorus fruit. It also adds a recipe for ender pearls from chorus fruit so there's no disruption to finding the stronghold. These new recipes also allow for farming of ender pearls and shulker shells from chorus plants late game.
The new recipes come with advancements to unlock them in the recipe book when the appropriate ingredient is obtained, so players who aren't aware of the pack being on your server won't be lost by the changes.
More information about data packs and how to use them can be found on the official Minecraft Wiki.