* separator between each, to {@code appendable}.
   */
  @CanIgnoreReturnValue
  public <A extends Appendable> A appendTo(A appendable, Iterable<?> parts) throws IOException {
    return appendTo(appendable, parts.iterator());
  }

  /**
   * Appends the string representation of each of {@code parts}, using the previously configured
   * separator between each, to {@code appendable}.

   *
   * Note that the list of proxies is never null, but it may be a list containing
   * only [Proxy.NO_PROXY]. This comes up in several situations:
   *
   * * If neither a proxy nor proxy selector is configured.
   * * If the proxy is configured explicitly as [Proxy.NO_PROXY].
   * * If the proxy selector returns only [Proxy.NO_PROXY].
   * * If the proxy selector returns an empty list or null.
   *

   * separator between each, to {@code appendable}.
   */
  @CanIgnoreReturnValue
  public <A extends Appendable> A appendTo(A appendable, Iterable<?> parts) throws IOException {
    return appendTo(appendable, parts.iterator());
  }

  /**
   * Appends the string representation of each of {@code parts}, using the previously configured
   * separator between each, to {@code appendable}.

     *
     * @return the maximum site length as configured
     */
    default int getMaxSiteLength() {
        return getFessConfig().getCrawlerDocumentMaxSiteLengthAsInteger();
    }

    /**
     * Abbreviates a site string to the maximum allowed length if configured.
     *
     * @param value the site string to abbreviate

            list.addAll(boostFunctionList);
        });
    }

    /**
     * Builds the base query from the user's search string using the configured query parser.
     * This method parses the query string, processes it, and applies any additional customizations.
     *
     * @param queryContext the query context containing the query string

     */
    protected ResourceUtil() {
        // nothing
    }

    /**
     * Gets the HTTP URL for the OpenSearch (Fesen) server.
     * First checks for a system-configured search engine address,
     * then falls back to the URL configured in FessConfig.
     *
     * @return the HTTP URL for the OpenSearch server
     */
    public static String getFesenHttpUrl() {

    this because it only occurs if you have proxy configured and you share a connection pool among
    multiple `OkHttpClient` instances.

    This particularly-subtle bug was caused by us assigning each `OkHttpClient` instance its own
    `NullProxySelector` when an explicit proxy is configured. But we don't share connections when
    the proxy selectors are different. Ugh!

        // Assert deleteByQuery was called with the configured empty index
        assertTrue(deleteByQueryCalled);
        assertEquals("", deleteIndex);

        // Assert result is empty when successful
        assertEquals("", result);
    }

    public void test_execute_withEmptyFieldName() {
        // Configure empty field name
        expiresFieldName = "";

        return filterChain.parse(query);
    }

    /**
     * Creates a new Lucene query parser with the current configuration.
     * The parser is configured with the default field, analyzer, wildcard settings,
     * and default operator.
     *
     * @return a configured Lucene query parser
     */
    protected org.apache.lucene.queryparser.classic.QueryParser createQueryParser() {

    /**
     * Initializes the CrawlingConfigHelper by setting up the crawling configuration cache.
     * This method is called automatically after the bean construction is complete.
     * The cache is configured with a maximum size of 100 entries and expires after 10 minutes.
     */
    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {