[MC-115481] 17w14a STDOUT spam when hurting/killing mobs

Not sure if this is a bug or by design. But I notice in the latest snapshot an awful lot of this...
[16:51:55] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:51:56] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:51:58] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:00] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:06] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:08] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:09] [Server thread/INFO]: [STDOUT]: minecraft:player_killed_entity
[16:52:09] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:31] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:31] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:31] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:32] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:33] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:37] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:43] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:45] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:45] [Server thread/INFO]: [STDOUT]: minecraft:player_killed_entity
[16:52:45] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:48] [Server thread/INFO]: [STDOUT]: minecraft:entity_hurt_player
[16:52:48] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:49] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:50] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:51] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:51] [Server thread/INFO]: [STDOUT]: minecraft:player_killed_entity
[16:52:51] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:51] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:52] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity
[16:52:52] [Server thread/INFO]: [STDOUT]: minecraft:player_killed_entity
[16:52:52] [Server thread/INFO]: [STDOUT]: minecraft:player_hurt_entity