code: @PluginFactory
      public static SplunkAppender build(@PluginAttribute("name") final String name,
                                         @PluginElement("AppenderRef") final AppenderRef appenderRef,
                                         @PluginConfiguration final Configuration config) {
          return new SplunkAppender(name, config, appenderRef);
      }
docs: Create appender.
  
  @param name        the name
  @param appenderRef the appender ref
  @param config      the config
  @return the appender