Deprecate xpack.task_manager.index setting

x-pack/plugins/task_manager/server/index.test.ts

@@ -0,0 +1,43 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { config } from './index';
+import { applyDeprecations, configDeprecationFactory } from '@kbn/config';
+
+const CONFIG_PATH = 'xpack.task_manager';
+
+const applyTaskManagerDeprecations = (settings: Record<string, unknown> = {}) => {
+  const deprecations = config.deprecations!(configDeprecationFactory);
+  const deprecationMessages: string[] = [];
+  const _config = {
+    [CONFIG_PATH]: settings,
+  };
+  const migrated = applyDeprecations(
+    _config,
+    deprecations.map((deprecation) => ({
+      deprecation,
+      path: CONFIG_PATH,
+    })),
+    (msg) => deprecationMessages.push(msg)
+  );
+  return {
+    messages: deprecationMessages,
+    migrated,
+  };
+};
+
+describe('deprecations', () => {
+  ['.foo', '.kibana_task_manager'].forEach((index) => {
+    it('logs a warning if index is set', () => {
+      const { messages } = applyTaskManagerDeprecations({ index });
+      expect(messages).toMatchInlineSnapshot(`
+        Array [
+          "\\"xpack.task_manager.index\\" is deprecated. Multitenancy by changing \\"kibana.index\\" will not be supported starting in 8.0. See https://ela.st/kbn-remove-legacy-multitenancy for more details",
+        ]
+      `);
+    });
+  });
+});

x-pack/plugins/task_manager/server/index.ts

@@ -4,9 +4,10 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { PluginInitializerContext } from 'src/core/server';
+import { get } from 'lodash';
+import { PluginConfigDescriptor, PluginInitializerContext } from 'src/core/server';
 import { TaskManagerPlugin } from './plugin';
-import { configSchema } from './config';
+import { configSchema, TaskManagerConfig } from './config';
 
 export const plugin = (initContext: PluginInitializerContext) => new TaskManagerPlugin(initContext);
 
@@ -26,6 +27,17 @@ export {
   TaskManagerStartContract,
 } from './plugin';
 
-export const config = {
+export const config: PluginConfigDescriptor<TaskManagerConfig> = {
   schema: configSchema,
+  deprecations: () => [
+    (settings, fromPath, log) => {
+      const taskManager = get(settings, fromPath);
+      if (taskManager?.index) {
+        log(
+          `"${fromPath}.index" is deprecated. Multitenancy by changing "kibana.index" will not be supported starting in 8.0. See https://ela.st/kbn-remove-legacy-multitenancy for more details`
+        );
+      }
+      return settings;
+    },
+  ],
 };