docs: protected static Analyzer getAnalyzer(Map<String, Analyzer> analyzers, String name) {
          if (StringUtils.isBlank(name)) {
              throw new IndexException("Not empty analyzer name required");
          }
          Analyzer analyzer = analyzers.get(name);
          if (analyzer == null) {
              analyzer = StandardAnalyzers.get(name);
              if (analyzer == null) {
                  try {
                      analyzer = (new ClasspathAnalyzerBuilder(name)).analyzer();
                  } catch (Exception e) {
                      throw new IndexException(e, "Not found analyzer '{}'", name);
                  }
              }
          }
          return analyzer;
      }