Database
[{"club_id":"","players":[{"player_id":363205,"comments":[{"_id":"5c61f001-768c-11ed-892f-346f24b28bd0"},{"_id":"5c61f001-768c-11ed-892f-346f24b28bd1"}]}]}]
Query
db.collection.update({"players.player_id":363205},{$pull:{"players.$[player].comments":{"_id":"5c61f001-768c-11ed-892f-346f24b28bd0"}}},{arrayFilters:[{"player.player_id":363205}]})