title: How to read lucene 5.5.5 index?
body: <p>What version of Luke is able to read 5.5.5 lucene's indexes? I've tried with Luke 4.10, 5.2, 5.5, 7.2 but always get this:</p>
  
  <pre><code>Invalid directory at the location, check console for more information. Last exception:
  org.apache.lucene.index.IndexFormatTooOldException: Format version is not supported (resource BufferedChecksumIndexInput(MMapIndexInput(path=""))): this index is too old (version: 5.5.5). This version of Lucene only supports indexes created with release 6.0 and later.
  </code></pre>