[ResponseOps] Cases analytics index configuration option (#223241)

**Merging into a feature branch**

## Summary

This PR adds a configuration option to enable the cases analytics index
logic.

`xpack.cases.analyticsIndex.enabled: true`

The task types are registered, but by default, no task is scheduled, and
no index is created.

## How to review

**The previous PRs are not merged yet, so only commits after
bd6f2b8 should be reviewed.**

Author: adcoelho

x-pack/platform/plugins/shared/cases/server/cases_analytics/tasks/synchronization_task/synchronization_task_runner.test.ts

@@ -338,33 +338,6 @@ describe('SynchronizationTaskRunner', () => {
   });
 
   describe('Error handling', () => {
-    it('An error is thrown for invalid task state', async () => {
-      const getESClient = async () => esClient;
-
-      taskRunner = new SynchronizationTaskRunner({
-        logger,
-        getESClient,
-        taskInstance: {
-          ...taskInstance,
-          state: {
-            // A missing esReindexTaskId should have missing sync times
-            lastSyncAttempt: 'some-time',
-          },
-        },
-      });
-
-      try {
-        await taskRunner.run();
-      } catch (e) {
-        expect(isRetryableError(e)).toBe(null);
-      }
-
-      expect(logger.error).toBeCalledWith(
-        '[.internal.cases] Synchronization reindex failed. Error: Invalid task state.',
-        { tags: ['cai-synchronization', 'cai-synchronization-error', '.internal.cases'] }
-      );
-    });
-
     it('calls throwRetryableError if the esClient throws a retryable error', async () => {
       esClient.tasks.get.mockRejectedValueOnce(new esErrors.ConnectionError('My retryable error'));
 

x-pack/platform/plugins/shared/cases/server/config.test.ts

@@ -12,6 +12,7 @@ describe('config validation', () => {
     it('sets the defaults correctly', () => {
       expect(ConfigSchema.validate({})).toMatchInlineSnapshot(`
         Object {
+          "analytics": Object {},
           "files": Object {
             "allowedMimeTypes": Array [
               "image/aces",

x-pack/platform/plugins/shared/cases/server/config.ts

@@ -23,6 +23,13 @@ export const ConfigSchema = schema.object({
   stack: schema.object({
     enabled: schema.boolean({ defaultValue: true }),
   }),
+  analytics: schema.object({
+    index: schema.maybe(
+      schema.object({
+        enabled: schema.boolean({ defaultValue: false }),
+      })
+    ),
+  }),
 });
 
 export type ConfigType = TypeOf<typeof ConfigSchema>;

x-pack/platform/plugins/shared/cases/server/plugin.test.ts

@@ -28,6 +28,7 @@ function getConfig(overrides = {}) {
     markdownPlugins: { lens: true },
     files: { maxSize: 1, allowedMimeTypes: ALLOWED_MIME_TYPES },
     stack: { enabled: true },
+    analytics: {},
     ...overrides,
   };
 }

x-pack/platform/plugins/shared/cases/server/plugin.ts

@@ -203,16 +203,17 @@ export class CasePlugin
 
     if (plugins.taskManager) {
       scheduleCasesTelemetryTask(plugins.taskManager, this.logger);
-      scheduleCasesAnalyticsSyncTasks({ taskManager: plugins.taskManager, logger: this.logger });
+      if (this.caseConfig.analytics.index?.enabled) {
+        scheduleCasesAnalyticsSyncTasks({ taskManager: plugins.taskManager, logger: this.logger });
+        createCasesAnalyticsIndexes({
+          esClient: core.elasticsearch.client.asInternalUser,
+          logger: this.logger,
+          isServerless: this.isServerless,
+          taskManager: plugins.taskManager,
+        }).catch(() => {}); // it shouldn't reject, but just in case
+      }
     }
 
-    createCasesAnalyticsIndexes({
-      esClient: core.elasticsearch.client.asInternalUser,
-      logger: this.logger,
-      isServerless: this.isServerless,
-      taskManager: plugins.taskManager,
-    }).catch(() => {}); // it shouldn't reject, but just in case
-
     this.userProfileService.initialize({
       spaces: plugins.spaces,
       // securityPluginSetup will be set to a defined value in the setup() function