add functional test ensuring _search request only pulls what is needed

Author: nreese

x-pack/test/functional/apps/maps/documents_source/docvalue_fields.js

@@ -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;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import expect from '@kbn/expect';
+
+export default function ({ getPageObjects, getService }) {
+  const PageObjects = getPageObjects(['maps']);
+  const inspector = getService('inspector');
+  const testSubjects = getService('testSubjects');
+  const log = getService('log');
+
+  describe('docvalue_fields', () => {
+    before(async () => {
+      await PageObjects.maps.loadSavedMap('document example');
+    });
+
+    async function getResponse() {
+      await inspector.open();
+      await inspector.openInspectorRequestsView();
+      await testSubjects.click('inspectorRequestDetailResponse');
+      const responseBody = await testSubjects.getVisibleText('inspectorResponseBody');
+      log.info(responseBody);
+      await inspector.close();
+      return JSON.parse(responseBody);
+    }
+
+    it('should only fetch geo_point field and nothing else when source does not have data driven styling', async () => {
+      await PageObjects.maps.loadSavedMap('document example');
+      const response = await getResponse();
+      const firstHit = response.hits.hits[0];
+      expect(Object.keys(firstHit).join(',')).to.equal('_index,_type,_id,_score,fields');
+      expect(Object.keys(firstHit.fields).join(',')).to.equal('geo.coordinates');
+    });
+
+    it('should only fetch geo_point field and data driven styling fields', async () => {
+      await PageObjects.maps.loadSavedMap('document example with data driven styles');
+      const response = await getResponse();
+      const firstHit = response.hits.hits[0];
+      expect(Object.keys(firstHit).join(',')).to.equal('_index,_type,_id,_score,fields');
+      expect(Object.keys(firstHit.fields).join(',')).to.equal('geo.coordinates,bytes,hour_of_day');
+    });
+
+  });
+}

x-pack/test/functional/apps/maps/documents_source/index.js

@@ -6,6 +6,7 @@
 
 export default function ({ loadTestFile }) {
   describe('documents source', function () {
+    loadTestFile(require.resolve('./docvalue_fields'));
     loadTestFile(require.resolve('./search_hits'));
     loadTestFile(require.resolve('./top_hits'));
   });