public function searchableFields()
    {
        $searchableFields = parent::searchableFields();
        unset($searchableFields['PublishFrom']);
        $searchableFields['Title'] = array(
            'field'  => 'TextField',
            'filter' => 'PartialMatchFilter',
            'title'  => _t('News.TITLE', 'Title')
        );
        $searchableFields['Author'] = array(
            'field'  => 'TextField',
            'filter' => 'PartialMatchFilter',
            'title'  => _t('News.AUTHOR', 'Author')
        );

        return $searchableFields;
    }