public Analyzer analyzer(String name) {
   PreBuiltAnalyzerProviderFactory analyzerProviderFactory = analyzerProviderFactory(name);
   if (analyzerProviderFactory == null) {
     return null;
   }
   return analyzerProviderFactory.analyzer();
 }
 public void close() {
   for (PreBuiltAnalyzerProviderFactory analyzerProviderFactory :
       analyzerProviderFactories.values()) {
     analyzerProviderFactory.analyzer().close();
   }
 }