"content_pl",
        "content_pt",
        "content_pt-br",
        "content_ro",
        "content_ru",
        "content_si",
        "content_sq",
        "content_sv",
        "content_ta",
        "content_te",
        "content_th",
        "content_tl",
        "content_tr",
        "content_uk",
        "content_ur",
        "content_vi",
        "content_zh-cn",

        return new TreeSet<E>(contents);
      }
    },
    UnmodifiableSetImpl {
      @Override
      public <E extends Comparable<E>> Set<E> create(Collection<E> contents) {
        return unmodifiableSet(new HashSet<E>(contents));
      }
    },
    SynchronizedSetImpl {
      @Override
      public <E extends Comparable<E>> Set<E> create(Collection<E> contents) {

During crawling and indexing, Fess:

1. Detects language from document content using Apache Tika
2. Validates against `supported.languages` list
3. Creates language-specific fields (e.g., `content_ja`, `title_en`, `content_sv`)
4. Applies language-specific analyzers for better search results

Configured in `fess_config.properties`:
```properties
indexer.language.fields=content,important_content,title
```

      for (List<Integer> contents : SAMPLE_INPUTS) {
        for (int toRemove = 0; toRemove < 10; toRemove++) {
          assertEquals(
              contents.contains(toRemove) && EVEN.apply(toRemove),
              filter(createUnfiltered(contents), EVEN).remove(toRemove));
        }
      }
    }

    public void testContains() {
      for (List<Integer> contents : SAMPLE_INPUTS) {

	}

	var contents []ItemContent
	if err := tx.Find(&contents).Error; err != nil {
		t.Errorf("failed to find contents, got error: %v", err)
	}
	if len(contents) != 3 {
		t.Errorf("expected %d contents, got %d", 3, len(contents))
	}

	// test delete
	if err := tx.Model(&item).Association("Contents").Unscoped().Delete(&contents[0]); err != nil {
		t.Errorf("failed to delete Contents, got error: %v", err)
	}

     */
    private void ensureRoomFor(int newElements) {
      @Nullable Object[] contents = this.contents;
      int newCapacity = expandedCapacity(contents.length, size + newElements);
      // expandedCapacity handles the overflow case
      if (newCapacity > contents.length || forceCopy) {
        this.contents = Arrays.copyOf(this.contents, newCapacity);
        forceCopy = false;
      }
    }

 * </ul>
 *
 * <p>Protected static class:</p>
 * <ul>
 *   <li>FieldAnalyzerMapping: Holds the analyzer names for different types of analysis (reading, reading term,
 *       normalization, contents, and contents reading) for a specific field.</li>
 * </ul>
 *
 * @see SuggestAnalyzer
 * @see FieldAnalyzerMapping
 */
public class AnalyzerSettings {
    /** Analyzer name for reading. */

    final Multiset<E> contents;

    /**
     * Creates a new builder. The returned builder is equivalent to the builder generated by {@link
     * ImmutableMultiset#builder}.
     */
    public Builder() {
      this(LinkedHashMultiset.create());
    }

    Builder(Multiset<E> contents) {
      this.contents = contents;
    }

    /**

      checkNotNull(builder);
      contents.addAll(builder.contents);
      return this;
    }

    @Override
    public ImmutableList<E> build() {
      return copyOf(contents);
    }

    ImmutableList<E> buildSorted(Comparator<? super E> comparator) {
      Collections.sort(contents, comparator);
      return copyOf(contents);
    }
  }

    }

    private void ensureRoomFor(int newElements) {
      @Nullable Object[] contents = this.contents;
      int newCapacity = expandedCapacity(contents.length, size + newElements);
      // expandedCapacity handles the overflow case
      if (contents.length < newCapacity || copyOnWrite) {
        this.contents = Arrays.copyOf(contents, newCapacity);
        copyOnWrite = false;
      }
    }

    /**