[support] indexing and search specific user fields in D7

Greetings,

Suppose I have added some text fields, say field_name, field_surname and field_address to my users (admin/config/people/accounts/fields in Drupal 7). I would like to index and search data in the fields field_name and field_surname only (not field_address). In D7 the included search module enables searching for usernames and emails only; I cannot search for specific user fileds. Is there a module for adding this functionality? I am not looking for a fancy solution like Solr, it is a small site, just simple, quick and dirty, I want to be able to search my users in two specific fileds. What should I do? What do suggest?

Thanks, Serhat