test: increase time for index creation

Author: nodkz

examples/northwind/__tests__/queriesFromIndex-test.js

@@ -25,7 +25,7 @@ beforeAll(async () => {
   db = con.db('northwind');
   await seed(db);
   // take time to mongo create indexes if needed
-  await new Promise((resolve) => setTimeout(resolve, 3000));
+  await new Promise((resolve) => setTimeout(resolve, 6000));
 });
 
 afterAll(async () => {