[ES|QL] Hides system indices (#166909)

## Summary

Closes https://github.com/elastic/kibana/issues/166874

Hides indices starting with . (and considered as system from the
autocomplete)

<img width="785" alt="image"
src="9c4cce79-c844-41b6-a30e-06dad49f7c52">


Followed the exact pattern that the dataview management page is using.

packages/kbn-text-based-editor/src/helpers.test.ts

@@ -5,8 +5,14 @@
  * in compliance with, at your election, the Elastic License 2.0 or the Server
  * Side Public License, v 1.
  */
-
-import { parseErrors, parseWarning, getInlineEditorText, getWrappedInPipesCode } from './helpers';
+import { dataViewPluginMocks } from '@kbn/data-views-plugin/public/mocks';
+import {
+  parseErrors,
+  parseWarning,
+  getInlineEditorText,
+  getWrappedInPipesCode,
+  getIndicesForAutocomplete,
+} from './helpers';
 
 describe('helpers', function () {
   describe('parseErrors', function () {
@@ -159,4 +165,25 @@ describe('helpers', function () {
       expect(code).toEqual('FROM index1 | keep field1, field2 | order field1');
     });
   });
+
+  describe('getIndicesForAutocomplete', function () {
+    it('should not return system indices', async function () {
+      const dataViewsMock = dataViewPluginMocks.createStartContract();
+      const updatedDataViewsMock = {
+        ...dataViewsMock,
+        getIndices: jest.fn().mockResolvedValue([
+          {
+            name: '.system1',
+            title: 'system1',
+          },
+          {
+            name: 'logs',
+            title: 'logs',
+          },
+        ]),
+      };
+      const indices = await getIndicesForAutocomplete(updatedDataViewsMock);
+      expect(indices).toStrictEqual(['logs']);
+    });
+  });
 });

packages/kbn-text-based-editor/src/helpers.ts

@@ -10,6 +10,7 @@ import { useRef } from 'react';
 import useDebounce from 'react-use/lib/useDebounce';
 import { monaco } from '@kbn/monaco';
 import { i18n } from '@kbn/i18n';
+import type { DataViewsPublicPluginStart } from '@kbn/data-views-plugin/public';
 
 export interface MonacoError {
   message: string;
@@ -172,3 +173,12 @@ export const getWrappedInPipesCode = (code: string, isWrapped: boolean): string
   });
   return codeNoLines.join(isWrapped ? ' | ' : '\n| ');
 };
+
+export const getIndicesForAutocomplete = async (dataViews: DataViewsPublicPluginStart) => {
+  const indices = await dataViews.getIndices({
+    showAllIndices: false,
+    pattern: '*',
+    isRollupIndex: () => false,
+  });
+  return indices.filter((index) => !index.name.startsWith('.')).map((i) => i.name);
+};

packages/kbn-text-based-editor/src/text_based_languages_editor.tsx

@@ -56,6 +56,7 @@ import {
   getDocumentationSections,
   MonacoError,
   getWrappedInPipesCode,
+  getIndicesForAutocomplete,
 } from './helpers';
 import { EditorFooter } from './editor_footer';
 import { ResizableButton } from './resizable_button';
@@ -371,12 +372,7 @@ export const TextBasedLanguagesEditor = memo(function TextBasedLanguagesEditor({
 
   const getSourceIdentifiers: ESQLCustomAutocompleteCallbacks['getSourceIdentifiers'] =
     useCallback(async () => {
-      const indices = await dataViews.getIndices({
-        showAllIndices: false,
-        pattern: '*',
-        isRollupIndex: () => false,
-      });
-      return indices.map((i) => i.name);
+      return await getIndicesForAutocomplete(dataViews);
     }, [dataViews]);
 
   const getFieldsIdentifiers: ESQLCustomAutocompleteCallbacks['getFieldsIdentifiers'] = useCallback(