Adds an enchantment called Spirit Flight, which can be applied to the Happy Ghast Harness to make the Happy Ghast faster. Has levels 1-5 and is about as rare as Infinity or Silk Touch from the Enchanting Table. It can also be obtained from Bastions (average ~2 per Bastion) or from Piglin bartering (about as rare as Fire Resistance Potions).
Drop the corresponding datapack file into the datapacks directory in your save file and you're good to go. Remove the file with /datapack disable or by deleting/moving/renaming the file. The datapack leaves the world fully compatible with vanilla.
Important note: datapacks completely overwrite any loot tables they modify; other datapacks that modify the Bastion or Bartering loot tables may overwrite this one or get overwritten by this one (this is determined by the order in which the datapacks are loaded)