diff --git a/packages/kbn-test/src/functional_test_runner/lib/config/read_config_file.ts b/packages/kbn-test/src/functional_test_runner/lib/config/read_config_file.ts
index 96fd525efa3e..2e40aeec4f43 100644
--- a/packages/kbn-test/src/functional_test_runner/lib/config/read_config_file.ts
+++ b/packages/kbn-test/src/functional_test_runner/lib/config/read_config_file.ts
@@ -21,7 +21,6 @@ import { ToolingLog } from '@kbn/dev-utils';
 import { defaultsDeep } from 'lodash';
 
 import { Config } from './config';
-import { transformDeprecations } from './transform_deprecations';
 
 const cache = new WeakMap();
 
@@ -52,8 +51,7 @@ async function getSettingsFromFile(log: ToolingLog, path: string, settingOverrid
     await cache.get(configProvider)!
   );
 
-  const logDeprecation = (error: string | Error) => log.error(error);
-  return transformDeprecations(settingsWithDefaults, logDeprecation);
+  return settingsWithDefaults;
 }
 
 export async function readConfigFile(log: ToolingLog, path: string, settingOverrides: any = {}) {
diff --git a/packages/kbn-test/src/functional_test_runner/lib/config/transform_deprecations.ts b/packages/kbn-test/src/functional_test_runner/lib/config/transform_deprecations.ts
deleted file mode 100644
index 08dfc4a4f61f..000000000000
--- a/packages/kbn-test/src/functional_test_runner/lib/config/transform_deprecations.ts
+++ /dev/null
@@ -1,32 +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.
- */
-
-// @ts-ignore
-import { createTransform, Deprecations } from '../../../../../../src/legacy/deprecation';
-
-type DeprecationTransformer = (
-  settings: object,
-  log: (msg: string) => void
-) => {
-  [key: string]: any;
-};
-
-export const transformDeprecations: DeprecationTransformer = createTransform([
-  Deprecations.unused('servers.webdriver'),
-]);
diff --git a/src/core/server/legacy/config/get_unused_config_keys.test.ts b/src/core/server/legacy/config/get_unused_config_keys.test.ts
index 2106a0748d81..f8506b574403 100644
--- a/src/core/server/legacy/config/get_unused_config_keys.test.ts
+++ b/src/core/server/legacy/config/get_unused_config_keys.test.ts
@@ -217,34 +217,4 @@ describe('getUnusedConfigKeys', () => {
       })
     ).toEqual([]);
   });
-
-  describe('using deprecation', () => {
-    it('should use the plugin deprecations provider', async () => {
-      expect(
-        await getUnusedConfigKeys({
-          coreHandledConfigPaths: [],
-          pluginSpecs: [
-            ({
-              getDeprecationsProvider() {
-                return async ({ rename }: any) => [rename('foo1', 'foo2')];
-              },
-              getConfigPrefix: () => 'foo',
-            } as unknown) as LegacyPluginSpec,
-          ],
-          disabledPluginSpecs: [],
-          settings: {
-            foo: {
-              foo: 'dolly',
-              foo1: 'bar',
-            },
-          },
-          legacyConfig: getConfig({
-            foo: {
-              foo2: 'bar',
-            },
-          }),
-        })
-      ).toEqual(['foo.foo']);
-    });
-  });
 });
diff --git a/src/core/server/legacy/config/get_unused_config_keys.ts b/src/core/server/legacy/config/get_unused_config_keys.ts
index 354bf9af042c..d10c574f0497 100644
--- a/src/core/server/legacy/config/get_unused_config_keys.ts
+++ b/src/core/server/legacy/config/get_unused_config_keys.ts
@@ -17,10 +17,7 @@
  * under the License.
  */
 
-import { set } from '@elastic/safer-lodash-set';
-import { difference, get } from 'lodash';
-// @ts-expect-error
-import { getTransform } from '../../../../legacy/deprecation/index';
+import { difference } from 'lodash';
 import { unset } from '../../../../legacy/utils';
 import { getFlattenedObject } from '../../../utils';
 import { hasConfigPathIntersection } from '../../config';
@@ -41,21 +38,6 @@ export async function getUnusedConfigKeys({
   settings: LegacyVars;
   legacyConfig: LegacyConfig;
 }) {
-  // transform deprecated plugin settings
-  for (let i = 0; i < pluginSpecs.length; i++) {
-    const spec = pluginSpecs[i];
-    const transform = await getTransform(spec);
-    const prefix = spec.getConfigPrefix();
-
-    // nested plugin prefixes (a.b) translate to nested objects
-    const pluginSettings = get(settings, prefix);
-    if (pluginSettings) {
-      // flattened settings are expected to be converted to nested objects
-      // a.b = true => { a: { b: true }}
-      set(settings, prefix, transform(pluginSettings));
-    }
-  }
-
   // remove config values from disabled plugins
   for (const spec of disabledPluginSpecs) {
     unset(settings, spec.getConfigPrefix());
diff --git a/src/legacy/deprecation/__tests__/create_transform.js b/src/legacy/deprecation/__tests__/create_transform.js
deleted file mode 100644
index d3838da5c339..000000000000
--- a/src/legacy/deprecation/__tests__/create_transform.js
+++ /dev/null
@@ -1,59 +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 { createTransform } from '../create_transform';
-import expect from '@kbn/expect';
-import sinon from 'sinon';
-
-describe('deprecation', function () {
-  describe('createTransform', function () {
-    it(`doesn't modify settings parameter`, function () {
-      const settings = {
-        original: true,
-      };
-      const deprecations = [
-        (settings) => {
-          settings.original = false;
-        },
-      ];
-      createTransform(deprecations)(settings);
-      expect(settings.original).to.be(true);
-    });
-
-    it('calls single deprecation in array', function () {
-      const deprecations = [sinon.spy()];
-      createTransform(deprecations)({});
-      expect(deprecations[0].calledOnce).to.be(true);
-    });
-
-    it('calls multiple deprecations in array', function () {
-      const deprecations = [sinon.spy(), sinon.spy()];
-      createTransform(deprecations)({});
-      expect(deprecations[0].calledOnce).to.be(true);
-      expect(deprecations[1].calledOnce).to.be(true);
-    });
-
-    it('passes log function to deprecation', function () {
-      const deprecation = sinon.spy();
-      const log = function () {};
-      createTransform([deprecation])({}, log);
-      expect(deprecation.args[0][1]).to.be(log);
-    });
-  });
-});
diff --git a/src/legacy/deprecation/create_transform.js b/src/legacy/deprecation/create_transform.js
deleted file mode 100644
index 72e8e153ed81..000000000000
--- a/src/legacy/deprecation/create_transform.js
+++ /dev/null
@@ -1,33 +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 { deepCloneWithBuffers as clone } from '../utils';
-import { forEach, noop } from 'lodash';
-
-export function createTransform(deprecations) {
-  return (settings, log = noop) => {
-    const result = clone(settings);
-
-    forEach(deprecations, (deprecation) => {
-      deprecation(result, log);
-    });
-
-    return result;
-  };
-}
diff --git a/src/legacy/deprecation/deprecations/__tests__/rename.js b/src/legacy/deprecation/deprecations/__tests__/rename.js
deleted file mode 100644
index 47c6b3257ff6..000000000000
--- a/src/legacy/deprecation/deprecations/__tests__/rename.js
+++ /dev/null
@@ -1,83 +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 expect from '@kbn/expect';
-import { rename } from '../rename';
-import sinon from 'sinon';
-
-describe('deprecation/deprecations', function () {
-  describe('rename', function () {
-    it('should rename simple property', function () {
-      const value = 'value';
-      const settings = {
-        before: value,
-      };
-
-      rename('before', 'after')(settings);
-      expect(settings.before).to.be(undefined);
-      expect(settings.after).to.be(value);
-    });
-
-    it('should rename nested property', function () {
-      const value = 'value';
-      const settings = {
-        someObject: {
-          before: value,
-        },
-      };
-
-      rename('someObject.before', 'someObject.after')(settings);
-      expect(settings.someObject.before).to.be(undefined);
-      expect(settings.someObject.after).to.be(value);
-    });
-
-    it('should rename property, even when the value is null', function () {
-      const value = null;
-      const settings = {
-        before: value,
-      };
-
-      rename('before', 'after')(settings);
-      expect(settings.before).to.be(undefined);
-      expect(settings.after).to.be(null);
-    });
-
-    it(`shouldn't log when a rename doesn't occur`, function () {
-      const settings = {
-        exists: true,
-      };
-
-      const log = sinon.spy();
-      rename('doesntExist', 'alsoDoesntExist')(settings, log);
-      expect(log.called).to.be(false);
-    });
-
-    it('should log when a rename does occur', function () {
-      const settings = {
-        exists: true,
-      };
-
-      const log = sinon.spy();
-      rename('exists', 'alsoExists')(settings, log);
-
-      expect(log.calledOnce).to.be(true);
-      expect(log.args[0][0]).to.match(/exists.+deprecated/);
-    });
-  });
-});
diff --git a/src/legacy/deprecation/deprecations/__tests__/unused.js b/src/legacy/deprecation/deprecations/__tests__/unused.js
deleted file mode 100644
index 4907c2b16698..000000000000
--- a/src/legacy/deprecation/deprecations/__tests__/unused.js
+++ /dev/null
@@ -1,76 +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 expect from '@kbn/expect';
-import sinon from 'sinon';
-import { unused } from '../unused';
-
-describe('deprecation/deprecations', function () {
-  describe('unused', function () {
-    it('should remove unused setting', function () {
-      const settings = {
-        old: true,
-      };
-
-      unused('old')(settings);
-      expect(settings.old).to.be(undefined);
-    });
-
-    it(`shouldn't remove used setting`, function () {
-      const value = 'value';
-      const settings = {
-        new: value,
-      };
-
-      unused('old')(settings);
-      expect(settings.new).to.be(value);
-    });
-
-    it('should remove unused setting, even when null', function () {
-      const settings = {
-        old: null,
-      };
-
-      unused('old')(settings);
-      expect(settings.old).to.be(undefined);
-    });
-
-    it('should log when removing unused setting', function () {
-      const settings = {
-        old: true,
-      };
-
-      const log = sinon.spy();
-      unused('old')(settings, log);
-
-      expect(log.calledOnce).to.be(true);
-      expect(log.args[0][0]).to.match(/old.+deprecated/);
-    });
-
-    it(`shouldn't log when no setting is unused`, function () {
-      const settings = {
-        new: true,
-      };
-
-      const log = sinon.spy();
-      unused('old')(settings, log);
-      expect(log.called).to.be(false);
-    });
-  });
-});
diff --git a/src/legacy/deprecation/deprecations/index.js b/src/legacy/deprecation/deprecations/index.js
deleted file mode 100644
index 527c99309ba8..000000000000
--- a/src/legacy/deprecation/deprecations/index.js
+++ /dev/null
@@ -1,21 +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.
- */
-
-export { rename } from './rename';
-export { unused } from './unused';
diff --git a/src/legacy/deprecation/deprecations/rename.js b/src/legacy/deprecation/deprecations/rename.js
deleted file mode 100644
index c96b9146b4e2..000000000000
--- a/src/legacy/deprecation/deprecations/rename.js
+++ /dev/null
@@ -1,36 +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 { set } from '@elastic/safer-lodash-set';
-import { get, isUndefined, noop } from 'lodash';
-import { unset } from '../../utils';
-
-export function rename(oldKey, newKey) {
-  return (settings, log = noop) => {
-    const value = get(settings, oldKey);
-    if (isUndefined(value)) {
-      return;
-    }
-
-    unset(settings, oldKey);
-    set(settings, newKey, value);
-
-    log(`Config key "${oldKey}" is deprecated. It has been replaced with "${newKey}"`);
-  };
-}
diff --git a/src/legacy/deprecation/deprecations/unused.js b/src/legacy/deprecation/deprecations/unused.js
deleted file mode 100644
index 4291063dc482..000000000000
--- a/src/legacy/deprecation/deprecations/unused.js
+++ /dev/null
@@ -1,33 +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 { get, isUndefined, noop } from 'lodash';
-import { unset } from '../../utils';
-
-export function unused(oldKey) {
-  return (settings, log = noop) => {
-    const value = get(settings, oldKey);
-    if (isUndefined(value)) {
-      return;
-    }
-
-    unset(settings, oldKey);
-    log(`${oldKey} is deprecated and is no longer used`);
-  };
-}
diff --git a/src/legacy/deprecation/get_transform.js b/src/legacy/deprecation/get_transform.js
deleted file mode 100644
index bf286901af62..000000000000
--- a/src/legacy/deprecation/get_transform.js
+++ /dev/null
@@ -1,30 +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 { noop } from 'lodash';
-
-import { createTransform } from './create_transform';
-import { rename, unused } from './deprecations';
-
-export async function getTransform(spec) {
-  const deprecationsProvider = spec.getDeprecationsProvider() || noop;
-  if (!deprecationsProvider) return;
-  const transforms = (await deprecationsProvider({ rename, unused })) || [];
-  return createTransform(transforms);
-}
diff --git a/src/legacy/deprecation/index.js b/src/legacy/deprecation/index.js
deleted file mode 100644
index 787563e7353c..000000000000
--- a/src/legacy/deprecation/index.js
+++ /dev/null
@@ -1,24 +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 { rename, unused } from './deprecations';
-
-export { createTransform } from './create_transform';
-export { getTransform } from './get_transform';
-export const Deprecations = { rename, unused };
diff --git a/src/legacy/plugin_discovery/plugin_config/__tests__/extend_config_service.js b/src/legacy/plugin_discovery/plugin_config/__tests__/extend_config_service.js
index a74bfb872e99..40f84f6f54b3 100644
--- a/src/legacy/plugin_discovery/plugin_config/__tests__/extend_config_service.js
+++ b/src/legacy/plugin_discovery/plugin_config/__tests__/extend_config_service.js
@@ -45,10 +45,6 @@ describe('plugin discovery/extend config service', () => {
             enabled: Joi.boolean().default(true),
             test: Joi.string().default('bonk'),
           }).default(),
-
-        deprecations({ rename }) {
-          return [rename('oldTest', 'test')];
-        },
       }),
   })
     .getPluginSpecs()
@@ -74,16 +70,14 @@ describe('plugin discovery/extend config service', () => {
         getConfigPrefix: sandbox.stub().returns(configPrefix),
       };
 
-      const logDeprecation = sandbox.stub();
-
       const getSettings = sandbox.stub(SettingsNS, 'getSettings').returns(rootSettings.foo.bar);
 
       const getSchema = sandbox.stub(SchemaNS, 'getSchema').returns(schema);
 
-      await extendConfigService(pluginSpec, config, rootSettings, logDeprecation);
+      await extendConfigService(pluginSpec, config, rootSettings);
 
       sinon.assert.calledOnce(getSettings);
-      sinon.assert.calledWithExactly(getSettings, pluginSpec, rootSettings, logDeprecation);
+      sinon.assert.calledWithExactly(getSettings, pluginSpec, rootSettings);
 
       sinon.assert.calledOnce(getSchema);
       sinon.assert.calledWithExactly(getSchema, pluginSpec);
@@ -145,41 +139,6 @@ describe('plugin discovery/extend config service', () => {
         expect(error.message).to.contain('"test" must be a string');
       }
     });
-
-    it('calls logDeprecation() with deprecation messages', async () => {
-      const config = Config.withDefaultSchema();
-      const logDeprecation = sinon.stub();
-      await extendConfigService(
-        pluginSpec,
-        config,
-        {
-          foo: {
-            bar: {
-              baz: {
-                oldTest: '123',
-              },
-            },
-          },
-        },
-        logDeprecation
-      );
-      sinon.assert.calledOnce(logDeprecation);
-      sinon.assert.calledWithExactly(logDeprecation, sinon.match('"oldTest" is deprecated'));
-    });
-
-    it('uses settings after transforming deprecations', async () => {
-      const config = Config.withDefaultSchema();
-      await extendConfigService(pluginSpec, config, {
-        foo: {
-          bar: {
-            baz: {
-              oldTest: '123',
-            },
-          },
-        },
-      });
-      expect(config.get('foo.bar.baz.test')).to.be('123');
-    });
   });
 
   describe('disableConfigExtension()', () => {
diff --git a/src/legacy/plugin_discovery/plugin_config/__tests__/settings.js b/src/legacy/plugin_discovery/plugin_config/__tests__/settings.js
index 2a26e29dfd63..750c5ee6c6f5 100644
--- a/src/legacy/plugin_discovery/plugin_config/__tests__/settings.js
+++ b/src/legacy/plugin_discovery/plugin_config/__tests__/settings.js
@@ -18,7 +18,6 @@
  */
 
 import expect from '@kbn/expect';
-import sinon from 'sinon';
 
 import { PluginPack } from '../../plugin_pack';
 import { getSettings } from '../settings';
@@ -33,7 +32,6 @@ describe('plugin_discovery/settings', () => {
     provider: ({ Plugin }) =>
       new Plugin({
         configPrefix: 'a.b.c',
-        deprecations: ({ rename }) => [rename('foo', 'bar')],
       }),
   })
     .getPluginSpecs()
@@ -59,28 +57,5 @@ describe('plugin_discovery/settings', () => {
     it('allows rootSettings to be undefined', async () => {
       expect(await getSettings(pluginSpec)).to.eql(undefined);
     });
-
-    it('resolves deprecations', async () => {
-      const logDeprecation = sinon.stub();
-      expect(
-        await getSettings(
-          pluginSpec,
-          {
-            a: {
-              b: {
-                c: {
-                  foo: true,
-                },
-              },
-            },
-          },
-          logDeprecation
-        )
-      ).to.eql({
-        bar: true,
-      });
-
-      sinon.assert.calledOnce(logDeprecation);
-    });
   });
 });
diff --git a/src/legacy/plugin_discovery/plugin_config/extend_config_service.js b/src/legacy/plugin_discovery/plugin_config/extend_config_service.js
index 9257227c0d62..a6d5d4ae5f99 100644
--- a/src/legacy/plugin_discovery/plugin_config/extend_config_service.js
+++ b/src/legacy/plugin_discovery/plugin_config/extend_config_service.js
@@ -30,8 +30,8 @@ import { getSchema, getStubSchema } from './schema';
  *  @param  {Function} [logDeprecation]
  *  @return {Promise<undefined>}
  */
-export async function extendConfigService(spec, config, rootSettings, logDeprecation) {
-  const settings = await getSettings(spec, rootSettings, logDeprecation);
+export async function extendConfigService(spec, config, rootSettings) {
+  const settings = await getSettings(spec, rootSettings);
   const schema = await getSchema(spec);
   config.extendSchema(schema, settings, spec.getConfigPrefix());
 }
diff --git a/src/legacy/plugin_discovery/plugin_config/settings.js b/src/legacy/plugin_discovery/plugin_config/settings.js
index 44ecb5718fe2..e6a4741d76ec 100644
--- a/src/legacy/plugin_discovery/plugin_config/settings.js
+++ b/src/legacy/plugin_discovery/plugin_config/settings.js
@@ -19,20 +19,16 @@
 
 import { get } from 'lodash';
 
-import { getTransform } from '../../deprecation';
-
 /**
  *  Get the settings for a pluginSpec from the raw root settings while
  *  optionally calling logDeprecation() with warnings about deprecated
  *  settings that were used
  *  @param  {PluginSpec} spec
  *  @param  {Object} rootSettings
- *  @param  {Function} [logDeprecation]
  *  @return {Promise<Object>}
  */
-export async function getSettings(spec, rootSettings, logDeprecation) {
+export async function getSettings(spec, rootSettings) {
   const prefix = spec.getConfigPrefix();
   const rawSettings = get(rootSettings, prefix);
-  const transform = await getTransform(spec);
-  return transform(rawSettings, logDeprecation);
+  return rawSettings;
 }