Database
[{"bookmaker":"Bet365","sport":"Football","data":[{"lastUpdate":"2372273273","events":[1,2]},{"lastUpdate":"2372234421","events":[3,4]},{"lastUpdate":"2375343461","events":[5,6]}]}]
Query
db.collection.update({"data.lastUpdate":{"$lt":"2372273273"}},{$set:{"data.$[data].events":[]}},{"arrayFilters":[{"data.lastUpdate":{"$lt":"2372273273"}}]})