Checkout to plugins.local/search_sphinx/.
Add required constants to config.php:
// *********************
// *** Sphinx search ***
// *********************
define('SPHINX_SERVER', 'localhost:9312');
define('SPHINX_ENABLED', false);
// Enable fulltext search using Sphinx (http://www.sphinxsearch.com)
// Please see http://tt-rss.org/wiki/SphinxSearch for more information.
define('SPHINX_INDEX', 'ttrss');
// Index name in Sphinx configuration. You can specify multiple indexes
// as a comma-separated string.