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error 28 mongodb

// 
// https://jira.mongodb.org/browse/SERVER-35220
// Change .$ to .$[]
// [
// 		{"arr":[
//			{"obj_field": "123"},
//			{"obj_field": "234"},
//			{"obj_field": "456"},
//			{"obj_field": "567"},
//		]}
// ]
//

db.test.updateMany({},{ $unset: {"arr.$[].obj_field": ""}})

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