* This class contains only static constants and should not be instantiated.
     */
    private Constants() {
        // Utility class - no instantiation
    }

    // ============================================================
    // System and UI Constants
    // ============================================================

    /** System line separator character sequence. */

                    factory.setFeature(org.codelibs.fess.crawler.Constants.FEATURE_EXTERNAL_GENERAL_ENTITIES, false);
                    factory.setFeature(org.codelibs.fess.crawler.Constants.FEATURE_EXTERNAL_PARAMETER_ENTITIES, false);
                    factory.setFeature(Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE, false);

            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        load();
    }

    /**
     * Returns a list of available KeyMatch instances.
     *
     * @return A list of KeyMatch instances.
     */
    public List<KeyMatch> getAvailableKeyMatchList() {
        return ComponentUtil.getComponent(KeyMatchBhv.class).selectList(cb -> {
            cb.query().matchAll();

    for (queue in TaskRunner.INSTANCE.activeQueues()) {
      // We wait at most 1 second, so we don't ever turn multiple lost threads into
      // a test timeout failure.
      val waitTime = (entryTime + 1_000_000_000L - System.nanoTime())
      if (!queue.idleLatch().await(waitTime, TimeUnit.NANOSECONDS)) {
        TaskRunner.INSTANCE.withLock {
          TaskRunner.INSTANCE.cancelAll()
        }

                    }

                    if (Constants.FALSE.equals(map.get(Constants.INDEXING_TARGET))) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("Skipped indexing (not a target): url={}", accessResult.getUrl());
                        }
                        continue;
                    }
                    map.remove(Constants.INDEXING_TARGET);

                    final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    factory.setFeature(Constants.FEATURE_SECURE_PROCESSING, true);
                    factory.setFeature(Constants.FEATURE_EXTERNAL_GENERAL_ENTITIES, false);
                    factory.setFeature(Constants.FEATURE_EXTERNAL_PARAMETER_ENTITIES, false);

 * used; or if the class exposes a public parameter-less constructor then it will be "new"d and
 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.

```
Input Text
    ↓
[Normalization] - NormalizerChain
    ↓
[Reading Conversion] - ReadingConverterChain
    ↓
[Analysis] - SuggestAnalyzer
```

Note: Suggester has TWO ReadingConverter instances:
- `readingConverter` - For query/metadata fields
- `contentsReadingConverter` - For content/document fields

---

## Key Components

### Suggester (Main Entry Point)

     * @param client The OpenSearch client.
     * @param settings The SuggestSettings instance.
     * @param readingConverter The ReadingConverter instance.
     * @param contentsReadingConverter The contents ReadingConverter instance.
     * @param normalizer The Normalizer instance.
     * @param analyzer The SuggestAnalyzer instance.
     * @param threadPool The ExecutorService for thread pooling.

 * used; or if the class exposes a public parameter-less constructor then it will be "new"d and
 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.