Minecraft wiki entry for Vindicator, associated text: Iron equipment from raid drops always has a 50% chance of being enchanted with a random enchantment at level 5-19.
Iron equipment from raid drops is always damaged.
These drops are also affected by the Looting enchantment.
The enchanted book has a level 30 enchantment, may be treasure enchantment.
Emeralds are both a regular raid drop and an additional raid drop.
With Looting III enchantment, a vindicator has spawned from a raid can drop up to 16 emeralds upon death, but the chance is 3.328% on Easy or Normal, and 4.096% on Hard.
It is possible for a vindicator spawned from a raid to drop both its naturally-spawned iron axe and a second iron axe from its additional raid drops (in Easy and Normal difficulty 0.3536% chance, 0.3952% chance with Looting I, 0.4368% chance with Looting II, and 0.4784% chance with Looting III, while in Hard difficulty 0.4352% chance, 0.4864% chance with Looting I, 0.5376% chance with Looting II, and 0.5888% chance with Looting III).