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javascript function sforce.interaction.runApex fails

sforce.interaction.runApex('Search', 'query', 'SELECT FirstName, LastName FROM Contact', function(response){
I'm trying to run the above javascript command for executing methods on Apex system classes: using class Search, calling method query, with the passed query statement, but I get the following error: Could not load Apex class: Search

I was able to call UserInfo.getUserName in a similar fashion without any issues. Not sure why the search class is not found. Any ideas? 

This is the api doc I am using: https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_methods_system_search.htm#apex_System_Search_query