Riak Secondary Indexes

[Balasundararao]

Hi I am using the riak-js version 0.10.2. i am creating the secondary indexes from the example

db.save('people', 'me', { age: 28 }, { index: { age: 28, alias: 'fran' } });
db.query('people', { age: [20,30] });
db.query('people', { alias: 'fran' });

when i try to run "db.query('people', { alias: 'fran' });" it returns undefined.
Do you have any suggestions how to get use the db.query ?