[MC-91042] Missing sound warnings

When you start the game it shows the following warnings:
Missing sounds 15w46a
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:block.brewing_stand.brew
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.death
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.grow
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:enchant.thorns.hit
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.guardian.thorns
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.horse.eat
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.crit
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.knockback
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.parry
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.strong
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.sweep
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.weak
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.rabbit.attack
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shield.block
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.ambient
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.close
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.death
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.open
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hit
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hurt
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.ambient
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.death
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.drink
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.hurt
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.throw
[17:48:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.zombie.infect