[data view editor] Fix data view timestamp validation (elastic#150398)

## Summary

Previously - If you changed a data view's index pattern AND the new
pattern didn't contain the timestamp field, you'd see a blank timestamp
field and it would let you save. The data view would have been saved
with the previous timestamp field which doesn't exist.

Now - The timestamp validator checks to make sure the selected timestamp
field is in the list of available options. This is helpful because it
keeps the previous timestamp value in case you do select an index
pattern that contains it.

Closes: elastic#150219

src/plugins/data_view_editor/public/components/data_view_editor_flyout_content.tsx

@@ -299,6 +299,8 @@ const IndexPatternEditorFlyoutContentComponent = ({
               form.updateFieldValues({ name: formData.title });
               await form.getFields().name.validate();
             }
+            // Ensures timestamp field is validated against current set of options
+            form.validateFields(['timestampField']);
             form.setFieldValue('isAdHoc', adhoc || false);
             form.submit();
           }}

src/plugins/data_view_editor/public/components/form_fields/timestamp_field.test.ts

@@ -0,0 +1,47 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { requireTimestampOptionValidator } from './timestamp_field';
+import { TimestampOption } from '../../types';
+
+const noOptions: TimestampOption[] = [];
+const options: TimestampOption[] = [
+  { display: 'a', fieldName: 'a' },
+  { display: 'a', fieldName: 'b' },
+];
+
+describe('timestamp field validator', () => {
+  test('no timestamp options - pass without value', async () => {
+    const result = await requireTimestampOptionValidator(noOptions).validator({
+      value: undefined,
+    } as any);
+    // no error
+    expect(result).toBeUndefined();
+  });
+  test('timestamp options - fail without value', async () => {
+    const result = await requireTimestampOptionValidator(options).validator({
+      value: undefined,
+    } as any);
+    // returns error
+    expect(result).toBeDefined();
+  });
+  test('timestamp options - pass with value', async () => {
+    const result = await requireTimestampOptionValidator(options).validator({
+      value: { label: 'a', value: 'a' },
+    } as any);
+    // no error
+    expect(result).toBeUndefined();
+  });
+  test('timestamp options - fail, value not in list', async () => {
+    const result = await requireTimestampOptionValidator(options).validator({
+      value: { label: 'c', value: 'c' },
+    } as any);
+    // returns error
+    expect(result).toBeDefined();
+  });
+});

src/plugins/data_view_editor/public/components/form_fields/timestamp_field.tsx

@@ -29,10 +29,13 @@ interface Props {
   matchedIndices$: Observable<MatchedIndicesSet>;
 }
 
-const requireTimestampOptionValidator = (options: TimestampOption[]): ValidationConfig => ({
-  validator: async ({ value }) => {
+export const requireTimestampOptionValidator = (
+  options: TimestampOption[]
+): ValidationConfig<any, string, { value?: any }> => ({
+  validator: async ({ value: selectedOption }) => {
     const isValueRequired = !!options.length;
-    if (isValueRequired && !value) {
+    const valueSelected = options.find((item) => item.fieldName === selectedOption?.value);
+    if (isValueRequired && (!selectedOption || !valueSelected)) {
       return {
         message: i18n.translate(
           'indexPatternEditor.requireTimestampOption.ValidationErrorMessage',

test/functional/apps/management/_index_pattern_create_delete.ts → test/functional/apps/management/_data_view_create_delete.ts

@@ -19,12 +19,13 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const find = getService('find');
   const PageObjects = getPageObjects(['settings', 'common', 'header']);
 
-  describe('creating and deleting default index', function describeIndexTests() {
+  describe('creating and deleting default data view', function describeIndexTests() {
     before(async function () {
       await esArchiver.emptyKibanaIndex();
       await esArchiver.loadIfNeeded(
         'test/functional/fixtures/es_archiver/kibana_sample_data_flights_index_pattern'
       );
+      await esArchiver.loadIfNeeded('test/functional/fixtures/es_archiver/logstash_functional');
       await kibanaServer.uiSettings.replace({});
       await PageObjects.settings.navigateTo();
       await PageObjects.settings.clickKibanaIndexPatterns();
@@ -34,6 +35,8 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       await esArchiver.unload(
         'test/functional/fixtures/es_archiver/kibana_sample_data_flights_index_pattern'
       );
+
+      await esArchiver.unload('test/functional/fixtures/es_archiver/logstash_functional');
     });
 
     describe('can open and close editor', function () {
@@ -59,6 +62,23 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
         await (await PageObjects.settings.getSaveDataViewButtonActive()).click();
         await PageObjects.settings.removeIndexPattern();
       });
+
+      it('correctly validates timestamp after index pattern changes', async function () {
+        await PageObjects.settings.clickKibanaIndexPatterns();
+        await PageObjects.settings.clickAddNewIndexPatternButton();
+        // setting the index pattern also sets the time field
+        await PageObjects.settings.setIndexPatternField('log*');
+        // wait for timestamp fields to load
+        await new Promise((e) => setTimeout(e, 1000));
+        // this won't have 'timestamp' field
+        await PageObjects.settings.setIndexPatternField('kibana*');
+        // wait for timestamp fields to load
+        await new Promise((e) => setTimeout(e, 1000));
+        await (await PageObjects.settings.getSaveIndexPatternButton()).click();
+        // verify an error is displayed
+        await find.byClassName('euiFormErrorText');
+        await testSubjects.click('closeFlyoutButton');
+      });
     });
 
     describe('special character handling', () => {

test/functional/apps/management/index.ts

@@ -22,7 +22,7 @@ export default function ({ getService, loadTestFile }: FtrProviderContext) {
     });
 
     loadTestFile(require.resolve('./_create_index_pattern_wizard'));
-    loadTestFile(require.resolve('./_index_pattern_create_delete'));
+    loadTestFile(require.resolve('./_data_view_create_delete'));
     loadTestFile(require.resolve('./_index_pattern_results_sort'));
     loadTestFile(require.resolve('./_index_pattern_popularity'));
     loadTestFile(require.resolve('./_kibana_settings'));