code: public static boolean isLuceneIndex(String indexName) {
  
          I_CmsSearchIndex i = OpenCms.getSearchManager().getIndex(indexName);
          return (i instanceof CmsSearchIndex) && (!(i instanceof CmsSolrIndex));
      }
docs: Returns <code>true</code> if the index for the given name is a Lucene index, <code>false</code> otherwise.<p>
  
  @param indexName the name of the index to check
  
  @return <code>true</code> if the index for the given name is a Lucene index