code: public static void generate(ConfigurationImpl configuration,
                                  IndexBuilder indexbuilder) {
          SingleIndexWriter indexgen;
          DocPath filename = DocPaths.INDEX_ALL;
          try {
              indexgen = new SingleIndexWriter(configuration,
                                               filename, indexbuilder);
              indexgen.generateIndexFile();
              indexgen.close();
          } catch (IOException exc) {
              configuration.standardmessage.error(
                          "doclet.exception_encountered",
                          exc.toString(), filename);
              throw new DocletAbortException(exc);
          }
      }
docs: Generate single index file, for all Unicode characters.
  
  @param indexbuilder IndexBuilder built by {@link IndexBuilder}
  @throws DocletAbortException