{
    "properties": {
       "encrypted": {
           "encrypt": {
               "keyId": [
                   {
                       "$binary": {
                           "base64": "LOCALAAAAAAAAAAAAAAAAA==", 
                           "subType": "04"
                       }
                   }
               ], 
               "bsonType": "string", 
               "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic"
           }
       }
    },
    "bsonType": "object"
}