code: private List<CmsSearchIndexSource> searchIndexSources() {
  
          CmsSearchManager manager = OpenCms.getSearchManager();
          I_CmsSearchIndex index = manager.getIndex(getParamIndexName());
          List<CmsSearchIndexSource> sources = index.getSources();
          return sources;
      }
docs: Returns the available search indexes of this installation.
  
  @return the available search indexes of this installation