docs: protected void setSearchAction(CmsListMetadata metadata, String columnId) {
  
          CmsListColumnDefinition col = metadata.getColumnDefinition(columnId);
          if ((columnId != null) && (col != null)) {
              if (metadata.getSearchAction() == null) {
                  // makes the list searchable
                  CmsListSearchAction searchAction = new CmsListSearchAction(col);
                  searchAction.useDefaultShowAllAction();
                  metadata.setSearchAction(searchAction);
              }
          }
      }