Database
[{_id:ObjectId("5a934e000102030405000000"),email:"abc",password:"123",role:"User",owners:[ObjectId("5a934e000102030405000000")]}]
Query
db.collection.update({_id:ObjectId("5a934e000102030405000000")},[{$set:{owners:{$concatArrays:[{$filter:{input:"$owners",cond:{$not:{$in:["$$this",[ObjectId("5a934e000102030405000000")]]}}}},[ObjectId("5a934e000102030405000001"),ObjectId("5a934e000102030405000002")]]}}}])