class Lucene_Helper {

protected $_find = array('ą','ż','ś','ź','ę','ć','ń','ó','ł','Ą','Ż','Ś','Ź','Ę','Ć','Ń','Ó','Ł');
	protected $_replace = array('a','z','s','x','e','c','n','o','l','A','Z','S','X','E','C','N','O','L');

	/**
	 *
	 * @param 	string 	$string
	 * @return 	string
	 */
	public function simplify($string) {
		foreach ($this->_find as $key => $value) {
			$string = str_replace($value, 'xxx' . $this->_replace[$key] . 'xxx', $string);
		}

		$string = iconv('UTF-8', 'ASCII//TRANSLIT', $string);
		return $string;
	}

	/**
	 *
	 * @param 	string 	$string
	 * @return 	string
	 */
	function unsimplify($string) {
		$string = iconv('ASCII//TRANSLIT', 'UTF-8', $string);
		foreach ($this->_replace as $key => $value) {
			$string = str_replace('xxx' . $value . 'xxx', $this->_find[$key], $string);
		}

		return $string;
	}

}

$luceneHelper = new Lucene_Helper();
$doc->addField(Zend_Search_Lucene_Field::UnStored('subject', $luceneHelper->simplify($this->subject)));
		$doc->addField(Zend_Search_Lucene_Field::UnStored('body', $luceneHelper->simplify($this->body)));

$queryStr = $luceneHelper->simplify('out query with zażółć gęsią jaźń ;)');
$query = Zend_Search_Lucene_Search_QueryParser::parse($queryStr);

$luceneHelper = new BluePaprica_Helper_Lucene();
$post = $postDAO->find($post_id)->current();
$highlightedBody = $this->query->highlightMatches($luceneHelper->simplify($post->body));
$highlightedSubject = $this->query->highlightMatches($luceneHelper->simplify($post->subject));