[Maps] Updates tests to not rely on field order (elastic#62092)

Elasticsearch master is now returning a different order for these
fields and is failing the promotion of our nightly builds.

Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>

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

@@ -29,26 +29,26 @@ export default function({ getPageObjects, getService }) {
       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');
+      expect(firstHit).to.only.have.keys(['_id', '_index', '_type', '_score', 'fields']);
+      expect(firstHit.fields).to.only.have.keys(['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');
+      expect(firstHit).to.only.have.keys(['_id', '_index', '_type', '_score', 'fields']);
+      expect(firstHit.fields).to.only.have.keys(['bytes', 'geo.coordinates', 'hour_of_day']);
     });
 
     it('should format date fields as epoch_millis when data driven styling is applied to a date field', async () => {
       await PageObjects.maps.loadSavedMap('document example with data driven styles on date field');
       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,@timestamp');
+      expect(firstHit).to.only.have.keys(['_id', '_index', '_type', '_score', 'fields']);
+      expect(firstHit.fields).to.only.have.keys(['@timestamp', 'bytes', 'geo.coordinates']);
       expect(firstHit.fields['@timestamp']).to.be.an('array');
-      expect(firstHit.fields['@timestamp'][0]).to.equal('1442709321445');
+      expect(firstHit.fields['@timestamp'][0]).to.eql('1442709321445');
     });
   });
 }