fix data-test-subj and related test

Author: mattkime

src/legacy/core_plugins/kibana/public/management/sections/index_patterns/edit_index_pattern/tabs/utils.ts

@@ -96,7 +96,7 @@ export function getTabs(
   tabs.push({
     name: getTitle('indexed', filteredCount, totalCount),
     id: TAB_INDEXED_FIELDS,
-    'data-test-subj': 'tab-indexFields',
+    'data-test-subj': 'tab-indexedFields',
   });
 
   if (indexPatternListProvider.areScriptedFieldsEnabled(indexPattern)) {

test/functional/page_objects/settings_page.ts

@@ -207,7 +207,7 @@ export function SettingsPageProvider({ getService, getPageObjects }: FtrProvider
     async getFieldsTabCount() {
       return retry.try(async () => {
         const text = await testSubjects.getVisibleText('tab-indexedFields');
-        return text.replace(/\((.*)\)/, '$1');
+        return text.split(' ')[1].replace(/\((.*)\)/, '$1');
       });
     }