How to: update 1.9 to 1.11

[SPGoding]

0. Change entity IDs.

Old name	New name	Change	Type
AreaEffectCloud	area_effect_cloud	Underscores	Entity
ArmorStand	armor_stand	Underscores	Entity
Cauldron	brewing_stand	Rename	Block entity
CaveSpider	cave_spider	Underscores	Entity
MinecartChest	chest_minecart	Rename	Entity
Control	command_block	Rename	Block entity
MinecartCommandBlock	commandblock_minecart	Rename	Entity
DLDetector	daylight_detector	Rename	Block entity
Trap	dispenser	Rename	Block entity
DragonFireball	dragon_fireball	Underscores	Entity
ThrownEgg	egg	Rename	Entity
EnchantTable	enchanting_table	Rename	Block entity
EndGateway	end_gateway	Underscore	Block entity
AirPortal	end_portal	Rename	Block entity
EnderChest	ender_chest	Underscore	Block entity
EnderCrystal	ender_crystal	Underscores	Entity
EnderDragon	ender_dragon	Underscores	Entity
ThrownEnderpearl	ender_pearl	Rename	Entity
EyeOfEnderSignal	eye_of_ender_signal	Underscores	Entity
FallingSand	falling_block	Rename	Entity
FireworksRocketEntity	fireworks_rocket	Rename	Entity
FlowerPot	flower_pot	Underscore	Block entity
MinecartFurnace	furnace_minecart	Rename	Entity
MinecartHopper	hopper_minecart	Rename	Entity
EntityHorse	horse	Rename	Entity
ItemFrame	item_frame	Underscores	Entity
RecordPlayer	jukebox	Rename	Block entity
LeashKnot	leash_knot	Underscores	Entity
LightningBolt	lightning_bolt	Underscores	Entity
LavaSlime	magma_cube	Rename	Entity
MinecartRideable	minecart	Rename	Entity
MobSpawner	mob_spawner	Underscore	Block entity
MushroomCow	mooshroom	Rename	Entity
Music	noteblock	Rename	Block entity
Ozelot	ocelot	Rename	Entity
PolarBear	polar_bear	Underscores	Entity
ShulkerBullet	shulker_bullet	Underscores	Entity
SmallFireball	small_fireball	Underscores	Entity
SpectralArrow	spectral_arrow	Underscores	Entity
ThrownPotion	potion	Rename	Entity
MinecartSpawner	spawner_minecart	Rename	Entity
Structure	structure_block	Rename	Block entity
PrimedTnt	tnt	Rename	Entity
MinecartTNT	tnt_minecart	Rename	Entity
VillagerGolem	villager_golem	Underscores	Entity
WitherBoss	wither	Rename	Entity
WitherSkull	wither_skull	Underscores	Entity
ThrownExpBottle	xp_bottle	Rename	Entity
XPOrb	xp_orb	Underscores	Entity
PigZombie	zombie_pigman	Rename	Entity

Horse was split into entity IDs horse, donkey, mule, skeleton_horse and zombie_horse for their respective types.
Skeleton was split into entity IDs skeleton, stray and wither_skeleton.
Zombie was split into entity IDs zombie, zombie_villager and husk.
Guardian was split into entity IDs guardian and elder_guardian.
Unused savegame IDs Mob and Monster were removed.
-- Minecraft wiki

1. Change NBT formats.

For all horses, HasReproduced, Type and Saddle tags are removed.
ChestedHorse and Items tags now apply only to mule and donkey.
SkeletonTrap and SkeletonTrapTime tags now apply only to skeleton_horse.
Elder tag is removed from guardian and elder_guardian.
ZombieType tag is removed from all zombie types.
ConversionTime and Profession tags now apply only to zombie_villager.
SkeletonType tag is removed from all skeleton types.
Pumpkin byte tag is added to snowman.
For ghast fireballs, blaze fireballs, fire charges, dragon fireballs and wither skulls:
xTile, yTile, zTile, inTile and inGround tags were removed,
and the life tag is no longer used for anything, but still saved/read.
-- Minecraft wiki

[SPGoding]

Finished.