BlendedInfixLookupFactory swallows root ioexception when it occurs

    try {
      return new BlendedInfixSuggester(core.getSolrConfig().luceneMatchVersion, 
                                       FSDirectory.open(new File(indexPath)),
                                       indexAnalyzer, queryAnalyzer, minPrefixChars,
                                       blenderType, numFactor);
    } catch (IOException e) {
      throw new RuntimeException();
    }