return childUrlSet.isEmpty() ? null : childUrlSet;
    }

    /**
     * Retrieves child URLs for a given document ID from the search engine index.
     * This method queries the search engine for child documents and extracts their URLs.
     *
     * @param searchEngineClient the search engine client to query
     * @param id the parent document ID to find children for

import org.codelibs.fess.util.ComponentUtil;

/**
 * Entity class containing highlighting configuration for search result text highlighting.
 * This class manages highlighting parameters such as fragment size, number of fragments,
 * and highlighting type for displaying search query matches in result snippets.
 */
public class HighlightInfo {
    /** The highlighting type (e.g., plain, html). */

        @Test
        @DisplayName("Should indicate search bits support")
        void testIsSupportSearchBits() throws Exception {
            // Test with search bits supported
            setPrivateField(response, "supportSearchBits", true);
            assertTrue(response.isSupportSearchBits(), "Should indicate search bits support");

            // Test without search bits support

import org.opensearch.action.search.SearchResponse;
import org.opensearch.action.support.WriteRequest.RefreshPolicy;
import org.opensearch.action.update.UpdateRequestBuilder;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.search.SearchHit;
import org.opensearch.search.SearchHits;
import org.opensearch.search.sort.SortBuilders;

 * This class holds information about a single Sitemap, including its location and last modification timestamp.
 * It implements the {@link Sitemap} interface.
 *
 * <p>
 * A Sitemap file provides search engines with a list of URLs available for crawling.
 * This class encapsulates the essential attributes of a Sitemap entry, allowing for efficient management
 * and processing of Sitemap data.
 * </p>
 *
 * <p>

    /** The key of the message: Search */
    public static final String LABELS_TOP_SEARCH = "{labels.top.search}";

    /** The key of the message: Fess */
    public static final String LABELS_index_title = "{labels.index_title}";

    /** The key of the message: Search */
    public static final String LABELS_index_form_search_btn = "{labels.index_form_search_btn}";

import org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.codelibs.core.CoreLibConstants;
import org.codelibs.fess.suggest.converter.AnalyzerConverter;

    private int currentPageNumber;

    /** Character mapping ID for search filtering. */
    public String id;

    /**
     * Default constructor for CharMappingPager.
     */
    public CharMappingPager() {
        // Default constructor
    }

    /**
     * Clears all search criteria and resets pagination settings.
     */
    public void clear() {
        allRecordCount = 0;

/**
 * Service class for managing favorite log operations.
 * Provides functionality to add URLs to user favorites and retrieve favorite URL lists.
 * This service handles the persistence and retrieval of favorite log entries in the search system.
 */
public class FavoriteLogService {

    /**
     * Default constructor.
     */
    public FavoriteLogService() {
        // Default constructor
    }

        buffer[1] = 0x00;
        // numEntries (2 bytes)
        buffer[2] = 0x05;
        buffer[3] = 0x00;
        // isEndOfSearch (2 bytes, bit 0 of first byte)
        buffer[4] = 0x01; // end of search = true
        buffer[5] = 0x00;
        // eaErrorOffset (2 bytes)
        buffer[6] = 0x00;
        buffer[7] = 0x00;
        // lastNameOffset (2 bytes)
        buffer[8] = 0x10;
        buffer[9] = 0x00;