/**
 * Utility class for merging SuggestItem objects.
 * Centralizes merge logic to reduce complexity in SuggestItem.
 *
 * <p>This class provides methods for merging two SuggestItem instances,
 * combining their fields, frequencies, and other attributes while
 * maintaining uniqueness where appropriate.
 */
public final class SuggestItemMerger {

    private SuggestItemMerger() {
        // Utility class
    }

    /**

        assertNotNull(result);
        assertFalse(result.hasFailure());

        runner.refresh();

        // Verify the item was updated (should have merged frequencies)
        GetResponse getResponse =
                runner.client().prepareGet().setIndex(suggester.getIndex()).setId(item.getId()).get(TimeValue.timeValueSeconds(30));
        assertTrue(getResponse.isExists());

/**
 * The SuggestItem class represents an item used for suggestions in the Fess search engine.
 * It contains various attributes such as text, readings, fields, tags, roles, languages, kinds, and frequencies.
 * The class provides methods to manipulate and retrieve these attributes, as well as to convert the item to and from different formats.
 */
public class SuggestItem {

    /**
     * The kind of suggest item.

    }

    @Test
    public void test_negativeFrequencies() {
        String[] text = { "test" };
        String[][] readings = { { "test" } };

        // Negative frequencies might be allowed (though unusual)
        SuggestItem item = new SuggestItem(text, readings, null, -1L, -1L, 1.0f, null, null, null, SuggestItem.Kind.QUERY);

        assertEquals(-1L, item.getDocFreq());

  }

  /**
   * Returns an immutable multiset containing all the keys in this multimap, in the same order and
   * with the same frequencies as they appear in this multimap; to get only a single occurrence of
   * each key, use {@link #keySet}.
   */
  @Override
  public ImmutableMultiset<K> keys() {
    return (ImmutableMultiset<K>) super.keys();
  }

                new String[] { SuggestConstants.DEFAULT_ROLE }, null, SuggestItem.Kind.QUERY);

        // Both Document and Query (simulated by setting both frequencies)
        String[][] readings3 = new String[1][];
        readings3[0] = new String[] { "both" };

vowels := [128]bool{'a': true, 'e': true, 'i': true, 'o': true, 'u': true, 'y': true}

// the array [10]float32{-1, 0, 0, 0, -0.1, -0.1, 0, 0, 0, -1}
filter := [10]float32{-1, 4: -0.1, -0.1, 9: -1}

// frequencies in Hz for equal-tempered scale (A4 = 440Hz)
noteFrequency := map[string]float32{
	"C0": 16.35, "D0": 18.35, "E0": 20.60, "F0": 21.83,
	"G0": 24.50, "A0": 27.50, "B0": 30.87,
}
</pre>