The FulltextSearch Extension provides fulltext search capabilities for the OntoWiki. It overrides the global SPARQL-based search function with an autocompletion featured index-search.
The required libraries are already integrated. If you want to update e.g. the elasticsearch-php library you can use the php-composer to update.
If you get an error about php-curl install the required package (example for Ubuntu): sudo apt-get install php5-curl