Added mock for es_service.

x-pack/plugins/canvas/public/components/datasource/datasource_component.js

@@ -20,7 +20,7 @@ import {
 import { isEqual } from 'lodash';
 import { i18n } from '@kbn/i18n';
 
-import { getDefaultIndex } from '../../lib/es_service';
+import { getDefaultIndex } from '../../../public/lib/es_service';
 import { DatasourceSelector } from './datasource_selector';
 import { DatasourcePreview } from './datasource_preview';
 

x-pack/plugins/canvas/storybook/__mocks__/es_service.ts

@@ -0,0 +1,10 @@
+/*
+ * 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; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+export const getDefaultIndex = () => {
+  return Promise.resolve('Demonstration index');
+};

x-pack/plugins/canvas/storybook/main.ts

@@ -56,6 +56,10 @@ const canvasWebpack = {
   resolve: {
     alias: {
       'src/plugins': resolve(KIBANA_ROOT, 'src/plugins'),
+      '../../../public/lib/es_service': resolve(
+        KIBANA_ROOT,
+        'x-pack/plugins/canvas/storybook/__mocks__/es_service.ts'
+      ),
     },
   },
 };