public void setSeacher(final RankFusionSearcher searcher) {
        this.searchers[0] = searcher;
    }

    public void register(final RankFusionSearcher searcher) {
        if (logger.isDebugEnabled()) {
            logger.debug("Load {}", searcher.getClass().getSimpleName());
        }
        final RankFusionSearcher[] newSearchers = Arrays.copyOf(searchers, searchers.length + 1);

        }

        final String[] searchers = DocumentUtil.getValue(docMap, Constants.SEARCHER, String[].class);
        if (searchers != null) {
            docMap.put(Constants.SEARCHER, ArrayUtil.add(searchers, getName()));
        } else {
            docMap.put(Constants.SEARCHER, new String[] { getName() });
        }

        return docMap;
    }

            final String[] docIds = userInfoHelper.getResultDocIds(URLDecoder.decode(queryId, Constants.UTF_8));
            if (docIds == null) {
                throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "No searched urls.");
            }

            searchHelper.getDocumentByDocId(docId, new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldLang() },
                    OptionalThing.empty()).ifPresent(doc -> {

public abstract class RankFusionSearcher {
    protected String name;

    public String getName() {
        if (name == null) {
            name = StringUtil.decamelize(this.getClass().getSimpleName().replace("Searcher", StringUtil.EMPTY)).toLowerCase(Locale.ENGLISH);
        }
        return name;
    }

    protected abstract SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean);

                          <SearchForm>http://localhost:8080/fess/</SearchForm>
                          <Url type="text/html" template="http://localhost:8080/fess/search?q={searchTerms}"/>
                          <InputEncoding>UTF-8</InputEncoding>
                          <OutputEncoding>UTF-8</OutputEncoding>
                        </OpenSearchDescription>

    public static final Boolean T = true;

    public static final Boolean F = false;

    public static final String SCORE = "score";

    public static final String SEARCHER = "searcher";

    public static final String ON = "on";

    public static final String READY = "ready";

    public static final String RUNNING = "running";

    public static final String DONE = "done";