diff --git a/src/legacy/server/config/deprecation_warnings.js b/src/legacy/server/config/deprecation_warnings.js
deleted file mode 100644
index 06cd3ba7cf037..0000000000000
--- a/src/legacy/server/config/deprecation_warnings.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- * Licensed to Elasticsearch B.V. under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch B.V. licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-import { transformDeprecations } from './transform_deprecations';
-
-export function configDeprecationWarningsMixin(kbnServer, server) {
-  transformDeprecations(kbnServer.settings, (message) => {
-    server.log(['warning', 'config', 'deprecation'], message);
-  });
-}
diff --git a/src/legacy/server/kbn_server.js b/src/legacy/server/kbn_server.js
index 87fb9dc8b9fec..70d7033e78a2f 100644
--- a/src/legacy/server/kbn_server.js
+++ b/src/legacy/server/kbn_server.js
@@ -31,7 +31,6 @@ import { loggingMixin } from './logging';
 import warningsMixin from './warnings';
 import { statusMixin } from './status';
 import pidMixin from './pid';
-import { configDeprecationWarningsMixin } from './config/deprecation_warnings';
 import { transformDeprecations } from './config/transform_deprecations';
 import configCompleteMixin from './config/complete';
 import optimizeMixin from '../../optimize';
@@ -89,7 +88,6 @@ export default class KbnServer {
       // adds methods for extending this.server
       serverExtensionsMixin,
       loggingMixin,
-      configDeprecationWarningsMixin,
       warningsMixin,
       statusMixin,