fix https://github.com/kuzzleio/kuzzle-sdk/issues/28#28

Author: ballinette

src/Kuzzle.js

@@ -552,7 +552,9 @@ Kuzzle.prototype.createIndex = function (index, options, cb) {
     options = null;
   }
 
-  this.query({controller: 'index', action: 'create', index: index}, {}, options, typeof cb !== 'function' ? null : cb);
+  this.query({controller: 'index', action: 'create', index: index}, {}, options, typeof cb !== 'function' ? null : function (err, res) {
+    cb(err, err ? undefined : res.result);
+  });
 
   return this;
 };

test/kuzzle/methods.test.js

@@ -832,7 +832,7 @@ describe('Kuzzle methods', function () {
       should(kuzzle.query).be.calledOnce();
       should(kuzzle.query).be.calledWith(expectedQuery, {});
       should(cb).be.calledOnce();
-      should(cb).be.calledWithExactly(null, {result: {acknowledged: true}});
+      should(cb).be.calledWithExactly(null, {acknowledged: true});
     });
 
     it('should execute the callback with an error if an error occurs', function () {