code: @CheckForNull
      public PluginWrapper getPlugin(String shortName) {
          for (PluginWrapper p : getPlugins()) {
              if(p.getShortName().equals(shortName))
                  return p;
          }
          return null;
      }
docs: Get the plugin instance with the given short name.
  @param shortName the short name of the plugin
  @return The plugin singleton or {@code null} if a plugin with the given short name does not exist.
  The fact the plugin is loaded does not mean it is enabled and fully initialized for the current Jenkins session.
  Use {@link PluginWrapper#isActive()} to check it.