title: Zend Lucene is under processing now... crashed my website
body: <pre><code>{Zend_Search_Lucene_Exception} Index is under processing now
  </code></pre>
  
  <p>This is what i get in my error log which makes crash the 50% of my website.
  What should i do to fix that please ?</p>
  
  <p>Thanks</p>