[8.16] [Security solution] `assistantKnowledgeBaseByDefault` flag defaults to `true` (#198178) (#198458)

# Backport

This will backport the following commits from `main` to `8.16`:
- [[Security solution] `assistantKnowledgeBaseByDefault` flag
defaults to `true`
(#198178)](https://github.com/elastic/kibana/pull/198178)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Steph
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`assistantKnowledgeBaseByDefault` flag defaults to
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BACKPORT-->

Co-authored-by: Steph Milovic <stephanie.milovic@elastic.co>

x-pack/packages/kbn-elastic-assistant-common/impl/capabilities/index.ts

@@ -19,6 +19,6 @@ export type AssistantFeatureKey = keyof AssistantFeatures;
  * Default features available to the elastic assistant
  */
 export const defaultAssistantFeatures = Object.freeze({
-  assistantKnowledgeBaseByDefault: false,
+  assistantKnowledgeBaseByDefault: true,
   assistantModelEvaluation: false,
 });

x-pack/packages/kbn-elastic-assistant/impl/assistant/index.test.tsx

@@ -23,7 +23,6 @@ import { Conversation } from '../assistant_context/types';
 import * as all from './chat_send/use_chat_send';
 import { useConversation } from './use_conversation';
 import { AIConnector } from '../connectorland/connector_selector';
-import { omit } from 'lodash';
 
 jest.mock('../connectorland/use_load_connectors');
 jest.mock('../connectorland/connector_setup');
@@ -140,84 +139,6 @@ describe('Assistant', () => {
   });
 
   describe('persistent storage', () => {
-    it('should refetchCurrentUserConversations after settings save button click', async () => {
-      const chatSendSpy = jest.spyOn(all, 'useChatSend');
-      await renderAssistant();
-
-      fireEvent.click(screen.getByTestId('settings'));
-
-      jest.mocked(useFetchCurrentUserConversations).mockReturnValue({
-        data: {
-          ...mockData,
-          welcome_id: {
-            ...mockData.welcome_id,
-            apiConfig: { newProp: true },
-          },
-        },
-        isLoading: false,
-        refetch: jest.fn().mockResolvedValue({
-          isLoading: false,
-          data: {
-            ...mockData,
-            welcome_id: {
-              ...mockData.welcome_id,
-              apiConfig: { newProp: true },
-            },
-          },
-        }),
-        isFetched: true,
-      } as unknown as DefinedUseQueryResult<Record<string, Conversation>, unknown>);
-
-      await act(async () => {
-        fireEvent.click(screen.getByTestId('save-button'));
-      });
-
-      expect(chatSendSpy).toHaveBeenLastCalledWith(
-        expect.objectContaining({
-          currentConversation: {
-            apiConfig: { newProp: true },
-            category: 'assistant',
-            id: mockData.welcome_id.id,
-            messages: [],
-            title: 'Welcome',
-            replacements: {},
-          },
-        })
-      );
-    });
-
-    it('should refetchCurrentUserConversations after settings save button click, but do not update convos when refetch returns bad results', async () => {
-      jest.mocked(useFetchCurrentUserConversations).mockReturnValue({
-        data: mockData,
-        isLoading: false,
-        refetch: jest.fn().mockResolvedValue({
-          isLoading: false,
-          data: omit(mockData, 'welcome_id'),
-        }),
-        isFetched: true,
-      } as unknown as DefinedUseQueryResult<Record<string, Conversation>, unknown>);
-      const chatSendSpy = jest.spyOn(all, 'useChatSend');
-      await renderAssistant();
-
-      fireEvent.click(screen.getByTestId('settings'));
-      await act(async () => {
-        fireEvent.click(screen.getByTestId('save-button'));
-      });
-
-      expect(chatSendSpy).toHaveBeenLastCalledWith(
-        expect.objectContaining({
-          currentConversation: {
-            apiConfig: { connectorId: '123' },
-            replacements: {},
-            category: 'assistant',
-            id: mockData.welcome_id.id,
-            messages: [],
-            title: 'Welcome',
-          },
-        })
-      );
-    });
-
     it('should delete conversation when delete button is clicked', async () => {
       await renderAssistant();
       const deleteButton = screen.getAllByTestId('delete-option')[0];

x-pack/plugins/security_solution/common/experimental_features.ts

@@ -111,7 +111,7 @@ export const allowedExperimentalValues = Object.freeze({
   /**
    * Enables new Knowledge Base Entries features, introduced in `8.15.0`.
    */
-  assistantKnowledgeBaseByDefault: false,
+  assistantKnowledgeBaseByDefault: true,
 
   /**
    * Enables the Managed User section inside the new user details flyout.

x-pack/test/security_solution_api_integration/test_suites/genai/knowledge_base/entries/trial_license_complete_tier/entries.ts

@@ -32,7 +32,7 @@ export default ({ getService }: FtrProviderContext) => {
   const es = getService('es');
   const ml = getService('ml') as ReturnType<typeof MachineLearningProvider>;
 
-  describe('@ess Basic Security AI Assistant Knowledge Base Entries', () => {
+  describe.skip('@ess Basic Security AI Assistant Knowledge Base Entries', () => {
     before(async () => {
       await installTinyElser(ml);
       await setupKnowledgeBase(supertest, log);