├── FessBoot.java              # Application entry point
├── app/
│   ├── web/                   # User-facing controllers
│   ├── web/admin/             # Admin controllers
│   ├── service/               # Business logic
│   └── job/                   # Background jobs
├── api/                       # REST API endpoints
├── opensearch/                # OpenSearch integration
│   ├── config/                # Config index (crawl configs, schedules)

import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.timer.TimeoutManager;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.logic.AccessContextLogic;
import org.codelibs.fess.app.service.ScheduledJobService;
import org.codelibs.fess.helper.JobHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;

     */
    protected ExecJob() {
        // Default constructor
    }

    /**
     * Executes the job and returns the result as a string.
     * This method contains the main business logic for the specific job implementation.
     *
     * @return the execution result message or summary
     */
    public abstract String execute();

    /**
     * Returns the execution type identifier for this job.

     * Interface for query processing filters.
     * Filters can modify, validate, or enhance queries before they are executed.
     */
    public interface Filter {
        /**
         * Executes the filter logic on the given query.
         *
         * @param context the query context containing search parameters and state
         * @param query the Lucene query to be processed

**Strategy**: `CrawlerClient`, `Extractor`, `Transformer` - pluggable implementations
**Builder**: `RequestDataBuilder`, `ExtractorBuilder` - fluent construction
**Template Method**: `AbstractCrawlerClient`, `AbstractExtractor` - common logic with overrides
**DI**: LastaFlute container with `@Resource` and XML config

### Core Principles

**Thread Safety**:
- `AtomicLong` for counters (`CrawlerContext.accessCount`)
- `volatile` for status flags

 */
public class RelatedContentHelper extends AbstractConfigHelper {

    /**
     * Default constructor for RelatedContentHelper.
     * The constructor does not perform any initialization logic as the actual
     * initialization is handled by the {@link #init()} method annotated with
     * {@code @PostConstruct}.
     */
    public RelatedContentHelper() {
        super();
    }

    }

    /**
     * @throws Exception
     */
    @Test
    public void testTrimSuffix() throws Exception {
        assertEquals("aaa", StringUtil.trimSuffix("aaaLogic", "Logic"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testTrimPrefix() throws Exception {
        assertEquals("AAA", StringUtil.trimPrefix("T_AAA", "T_"));
    }

    /**

 * <li>Manages cleanup of processed crawler session data</li>
 * </ul>
 *
 * <p>The updater runs continuously until crawling is finished and all documents are processed.
 * It includes error handling, retry logic, and performance monitoring capabilities.
 *
 */
public class IndexUpdater extends Thread {
    /** Logger for this class */
    private static final Logger logger = LogManager.getLogger(IndexUpdater.class);

                runner.client().prepareGet().setIndex(suggester.getIndex()).setId(item.getId()).get(TimeValue.timeValueSeconds(30));
        assertTrue(getResponse.isExists());
        // The actual frequency value would depend on merge logic
    }

    @Test
    public void test_writeWithUpdateButNonExistentItem() throws Exception {
        String[][] readings = new String[1][];
        readings[0] = new String[] { "test_new" };

        return redirect(getClass());
    }

    // ===================================================================================
    //                                                                        Assist Logic
    //                                                                        ============

    private static OptionalEntity<AccessToken> getEntity(final CreateForm form, final String username, final long currentTime) {