title: Can't start solr because of missing segment file
body: <p>I made a mistake. I downloaded the full data folder from my solr engine to replace the one on my machine. Since this time I can't start solr anymore on my machine.</p>
  
  <p>Here are the main error messages :</p>
  
  <pre><code>3865 [coreLoadExecutor-5-thread-1][2015-08-19 10:17:04.742] ERROR org.apache.solr.core.CoreContainer  ? Error creating core [ezp-default]: Error opening new searcher
  org.apache.solr.common.SolrException: Error opening new searcher
  </code></pre>
  
  <p>and</p>
  
  <pre><code>Caused by: java.nio.file.NoSuchFileException: /whateverFolder/ezpublish_legacy/extension/ezfind/java/solr/ezp-default/data/index/segments_q72
  </code></pre>
  
  <p>This file is actually missing.</p>
  
  <p>I tried different things:</p>
  
  <ul>
  <li>stop / restart solr</li>
  <li>empty data folder</li>
  <li>event reinstall my cms search plugin</li>
  </ul>
  
  <p>Nothing changed. The error is the same.</p>
  
  <p>One idea I have is that solr start routine is based on a kind of cache or db where it is written "load this segments_q72" file.</p>
  
  <p>Do you have any clue on how to repair this ?
  Thank you very much.</p>