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/**
   * Constructs an IndexWriter for the index in <code>path</code>.
   * Text will be analyzed with <code>a</code>.  If <code>create</code>
   * is true, then a new, empty index will be created in
   * <code>path</code>, replacing the index already there, if any.
   *
   * @param path the path to the index directory
   * @param a the analyzer to use
   * @param create <code>true</code> to create the index or overwrite
   *  the existing one; <code>false</code> to append to the existing
   *  index
   * @throws IOException if the directory cannot be read/written to, or
   *  if it does not exist, and <code>create</code> is
   *  <code>false</code>
   */
  public IndexWriter(String path, Analyzer a, boolean create)
       throws IOException {
    this(FSDirectory.getDirectory(path, create), a, create, true);
  }