set unindexed algorithm

Author: DmitryLukyanov

tests/MongoDB.Driver.Tests/Specifications/client-side-encryption/prose-tests/ClientEncryptionProseTests.cs

@@ -143,8 +143,8 @@ void RunTestCase(int testCase)
                                 var createCollectionOptions = new CreateCollectionOptions { EncryptedFields = encryptedFields };
                                 var collection = CreateEncryptedCollection(client, clientEncryption, __collCollectionNamespace, createCollectionOptions, kmsProvider, async);
                                 var dataKey = createCollectionOptions.EncryptedFields["fields"].AsBsonArray[0].AsBsonDocument["keyId"].AsGuid; // get generated datakey
-                                var encryptedValue = ExplicitEncrypt(clientEncryption, new EncryptOptions(algorithm: EncryptionAlgorithm.AEAD_AES_256_CBC_HMAC_SHA_512_Deterministic, keyId: dataKey), "123-45-6789", async); // use explicit encryption to encrypt data before inserting
-                                Insert(collection, async, new BsonDocument("ssn", encryptedValue)); // this still fails as in case 1
+                                var encryptedValue = ExplicitEncrypt(clientEncryption, new EncryptOptions(algorithm: EncryptionAlgorithm.Unindexed, keyId: dataKey), "123-45-6789", async); // use explicit encryption to encrypt data before inserting
+                                Insert(collection, async, new BsonDocument("ssn", encryptedValue));
                             }
                             break;
                         default: throw new Exception($"Unexpected test case {testCase}.");