* performance
* performance optimization

* return type
* return value

* security
* security scheme

* task
* background task
* task function

* template
* template engine

* type annotation
* type hint

* server worker
* Uvicorn worker
* Gunicorn Worker
* worker process
* worker class
* workload

* deployment
* deploy하다

* SDK

import jakarta.annotation.Resource;

/**
 * API action for admin Stopwords dictionary management.
 * Provides REST endpoints for managing stopwords dictionary items in the Fess search engine.
 */
public class ApiAdminDictStopwordsAction extends FessApiAdminAction {

    /**
     * Default constructor.
     */
    public ApiAdminDictStopwordsAction() {
        super();
    }

import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin path mapping management.
 * Provides RESTful API endpoints for managing path mapping settings in the Fess search engine.
 * Path mappings define URL path transformations and redirections for crawling and indexing.
 */
public class ApiAdminPathmapAction extends FessApiAdminAction {

import jakarta.annotation.Resource;

/**
 * API action for admin related content management.
 * Provides RESTful API endpoints for managing related content settings in the Fess search engine.
 * Related content settings define content relationships and associations for search results.
 */
public class ApiAdminRelatedcontentAction extends FessApiAdminAction {

import org.opensearch.monitor.process.ProcessProbe;

/**
 * This class is a timer target for monitoring system-level statistics.
 * It collects and logs information about the operating system, process,
 * JVM, and search engine.
 */
public class SystemMonitorTarget extends MonitorTarget {
    private static final Logger logger = LogManager.getLogger(SystemMonitorTarget.class);

    /**
     * Constructs a new system monitor target.
     */

    private void scheduleServiceRetry() {
        scheduler.schedule(() -> {
            try {
                // Test if service is back online
                if (testWitnessService()) {
                    serviceAvailable = true;
                    log.info("Witness service is back online");
                    
                    // Re-register for notifications
                    reregisterNotifications();

Main operations: `suggest()`, `popularWords()`, `indexer()`, `createIndexIfNothing()`, `createNextIndex()`, `switchIndex()`, `removeDisableIndices()`

### SuggestIndexer (Indexing Engine)
Location: `src/main/java/org/codelibs/fess/suggest/index/SuggestIndexer.java`

Handles all indexing operations, content parsing, and word management (bad words, elevate words).

### SuggestSettings (Configuration)

import org.lastaflute.web.response.StreamResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin bad word management.
 * Provides REST endpoints for managing bad words in the Fess search engine.
 */
public class ApiAdminBadwordAction extends FessApiAdminAction {

    /**
     * Default constructor.
     */
    public ApiAdminBadwordAction() {
        super();
    }

  auto entry = GetFactories().find(name);
  if (entry != GetFactories().end()) {
    default_factory = GetFactories().find(name)->second;
    return absl::OkStatus();
  }
  string msg = absl::StrCat(
      "No tracing engine factory has been registered with the key '", name,
      "' (available: ");
  // Ensure deterministic (sorted) order in the error message
  std::set<string> factories_sorted;
  for (const auto& factory : GetFactories())

import jakarta.annotation.Resource;

/**
 * API action for admin Kuromoji dictionary management.
 * Provides REST endpoints for managing Kuromoji dictionary items in the Fess search engine.
 */
public class ApiAdminDictKuromojiAction extends FessApiAdminAction {

    /**
     * Default constructor.
     */
    public ApiAdminDictKuromojiAction() {
        super();
    }