This feature allows you to use Joomla’s Smart Search functionality.
First you need to install and enable the the plugin - Finder - DJ-Catalog2 (You can download the plugin from DJ-Catalog2 Download Section).
Once installed be sure it’s enabled. In your Joomla backend go to Extensions -> Plugins -> Finder DJ-Catalog2 and make sure it’s enabled. 
Now go to Components -> Smart Search and click “Index” 
button.
Indexer will now start running and once finished you’ll find indexed products:
How to use Smart Search functionality
First you need to make sure that you have Smart Search module installed, enabled and assigned to proper module position.
Add this module by going to Extensions -> Modules -> New -> Smart Search
Now give the module Title, assign it to proper module position and assign to pages you want it to appear and save the module.
When all is set you’ll benefit the autocomplete functionality - Smart Search for DJ-Catalog2
