Database
[{"_id":ObjectId("623ebe3315e29330ede4e631"),"release_id":43239,"cover":BinData(0,"PCFET0NUWVBFIGh0bWw+CjxodG1sIGxh")},{"_id":ObjectId("623ebe3315e29330ede4e630"),"release_id":43238,"cover":BinData(0,"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")}]
Query
db.collection.aggregate([{"$addFields":{"cover":{"$cond":{"if":{$lt:[{"$binarySize":"$cover"},1775]},"then":null,"else":"$cover"}}}},{"$merge":{"into":"collection","on":"_id","whenMatched":"replace"}}])