@Override
    public Class<?> getElementClassOfCollection(final int index) {
        assertArgumentArrayIndex("index", index, parameterTypes.length);

        if (!Collection.class.isAssignableFrom(parameterTypes[index]) || !isParameterized(index)) {
            return null;
        }
        final ParameterizedClassDesc pcd = parameterizedClassDescs[index].getArguments()[0];
        if (pcd == null) {
            return null;

```

## Optional: Search Analysis Support

If your language requires special text analysis (stemming, stop words, etc.), you may need to configure OpenSearch analyzers.

### 1. Update OpenSearch Index Template

Edit `src/main/resources/fess_indices/fess.json` to add language-specific analyzers.

**Example for Swedish:**
```json
{
  "analysis": {
    "filter": {
      "swedish_stop": {

        assertEquals("", result);
    }

    @Test
    public void test_execute_withCustomIndexName() {
        // Configure custom index name
        documentUpdateIndex = "custom.document.index";

        // Re-register FessConfig with updated index name
        fessConfig = new TestFessConfig() {
            @Override
            public String getIndexFieldExpires() {

  }

  int getValue(int index) {
    checkElementIndex(index, size);
    return values[index];
  }

  void setValue(int index, int newValue) {
    checkElementIndex(index, size);
    values[index] = newValue;
  }

  Entry<K> getEntry(int index) {
    checkElementIndex(index, size);
    return new MapEntry(index);
  }

  private final class MapEntry extends AbstractEntry<K> {

    }

    private int reverseIndex(int index) {
      int size = size();
      checkElementIndex(index, size);
      return (size - 1) - index;
    }

    private int reversePosition(int index) {
      int size = size();
      checkPositionIndex(index, size);
      return size - index;
    }

    @Override
    public void add(int index, @ParametricNullness T element) {

    @ParametricNullness final K key;
    int index;

    EntryForKey(int index) {
      // The cast is safe because we call forEntry only for indexes that contain entries.
      this.key = uncheckedCastNullableTToT(keys[index]);
      this.index = index;
    }

    void updateIndex() {
      if (index == ABSENT || index > size || !Objects.equals(keys[index], key)) {
        index = findEntryByKey(key);
      }
    }

    // Inlineable fast-path loop which hands off to escapeSlow() only if needed
    int length = string.length();
    for (int index = 0; index < length; index++) {
      if (escape(string.charAt(index)) != null) {
        return escapeSlow(string, index);
      }
    }
    return string;
  }

  /**
   * Returns the escaped form of the given character, or {@code null} if this character does not

      for (int index : indexes) {
        builder.put(index, singleQuantile(index, scale, dataset));
      }
      return builder.buildOrThrow();
    }
  },

  /** Uses {@link Quantiles}. */
  TARGET {

    @Override
    double singleQuantile(int index, int scale, double[] dataset) {
      return Quantiles.scale(scale).index(index).computeInPlace(dataset);
    }

    public @Nullable V get(@Nullable Object key) {
      Integer index = keyIndex.get(key);
      if (index == null) {
        return null;
      } else {
        return getValue(index);
      }
    }

    @Override
    public @Nullable V put(K key, @ParametricNullness V value) {
      Integer index = keyIndex.get(key);
      if (index == null) {
        throw new IllegalArgumentException(

        .replaceAll(
            (K k, V v) -> {
              int index = keys().asList().indexOf(k);
              return values().asList().get(index + 1);
            });
    List<Entry<K, V>> orderedEntries = getOrderedElements();
    int index = 0;
    for (K key : getMap().keySet()) {
      assertEquals(orderedEntries.get(index).getKey(), key);
      index++;
    }
  }

  @MapFeature.Require(absent = SUPPORTS_PUT)