NIFI-14916 Fixed MongoDBControllerService handling of X509 authentication (apache#10250)

Signed-off-by: David Handermann <exceptionfactory@apache.org>

Author: pvillard31

nifi-extension-bundles/nifi-mongodb-bundle/nifi-mongodb-services/src/main/java/org/apache/nifi/mongodb/MongoDBControllerService.java

@@ -131,6 +131,14 @@ protected MongoClient createClient(ConfigurationContext context, MongoClient exi
                     case PLAIN -> builder.credential(MongoCredential.createPlainCredential(user, database, passw.toCharArray()));
                     default -> throw new IllegalArgumentException("Unsupported authentication mechanism with username and password: " + mechanism);
                 }
+            } else if (authMechanism != null) {
+                final AuthenticationMechanism mechanism = AuthenticationMechanism.fromMechanismName(authMechanism.toUpperCase());
+                switch (mechanism) {
+                    case MONGODB_X509 -> builder.credential(MongoCredential.createMongoX509Credential(user));
+                    case MONGODB_OIDC -> builder.credential(MongoCredential.createOidcCredential(user));
+                    case GSSAPI -> builder.credential(MongoCredential.createGSSAPICredential(user));
+                    default -> throw new IllegalArgumentException("Unsupported authentication mechanism with username only: " + mechanism);
+                }
             } else if (user != null && passw != null) {
                 final MongoCredential credential = MongoCredential.createCredential(user, database, passw.toCharArray());
                 builder.credential(credential);