remove LP deprecations

Author: mshustov

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());