为什么我在 Lucene (zend) 中的 2 个字段搜索失败？

Question

因此，我有两个正在索引的字段：

| NAME | TYPE |
-------------------------------------
|Texas Steak | Restaurant |
|Bone Digs Restaurant | Restaurant |
|Rain Sushi | Restaurant |
|Brazil Steakhouse | Restaurant |
|Alfredos | Restaurant |
|Mediterranean Corner | Restaurant |
|Korean Taqueria | Restaurant |
|Orlando Cantina | Restaurant |
|Boomer Bar and Grill | Restaurant |
|Top Spice | Restaurant |
|Tamarind | Restaurant |

我正在以以下方式建立索引：

Zend_Search_Lucene_Analysis_Analyzer::setDefault(new Zend_Search_Lucene_Analysis_Analyzer_Common_TextNum_CaseInsensitive()); 
//let lucene search for numbers as well as words
try {
$index = Zend_Search_Lucene::create('data/');
} catch(Zend_Search_Lucene_Exception $e){
echo "Unable {$e->getMessage()}";
}

$mdlPage = new Application_Model_DbTable_Business();
$currentPages = $mdlPage->fetchAll();
if($currentPages->count() >= 0) {
  foreach ($currentPages as $p) {
    $doc = new Zend_Search_Lucene_Document();
    $doc->addField(Zend_Search_Lucene_Field::text('business_name', $p->business_name));
    $doc->addField(Zend_Search_Lucene_Field::text('primary_category',$p->primary_category));
        $index->addDocument($doc);
    }
   }
   $index->commit();
   $index->optimize();
   $this->view->indexSize = $index->numDocs();

现在，我正在以以下方式查询索引：

$query = new Zend_Search_Lucene_Search_Query_MultiTerm();

$query->addTerm(new Zend_Search_Lucene_Index_Term($keyword,'business_name'),null);

$query->addTerm(new Zend_Search_Lucene_Index_Term($keyword,'primary_category'),null);
echo $query;
try {
$results = $index->find($query);
}
catch (Zend_Search_Lucene_Exception $e) {
echo "Unable {$e->getMessage()}";
}

这是奇怪的事情。如果我查询“thai”或“business_name”字段中的任何单词，我会得到结果。但是，一旦我查询“餐厅”，我的屏幕就无法解析，而是变成白屏。如果我将代码更改为：

$query = new Zend_Search_Lucene_Search_Query_MultiTerm();

//$query->addTerm(new Zend_Search_Lucene_Index_Term($keyword,'business_name'),null);

$query->addTerm(new Zend_Search_Lucene_Index_Term($keyword,'primary_category'),null);

那么我确实会得到结果。我不明白 Lucene 不喜欢什么。是我的数据吗？这是我创建查询的方式吗？或者这就是我创建索引的方式？