* <li>{@link #READING_PREFIX} - The prefix for reading fields.</li>
 * <li>{@link #SCORE} - The score field.</li>
 * <li>{@link #QUERY_FREQ} - The query frequency field.</li>
 * <li>{@link #DOC_FREQ} - The document frequency field.</li>
 * <li>{@link #USER_BOOST} - The user boost field.</li>
 * <li>{@link #KINDS} - The kinds field.</li>
 * <li>{@link #TIMESTAMP} - The timestamp field.</li>

            logger.info("Deleting all suggest items: index={}", index);
        }
        return deleteByQuery(index, QueryBuilders.matchAllQuery());
    }

    /**
     * Deletes document words (words with DOC_FREQ >= 1 that don't have QUERY or USER kinds).
     *
     * @param index The index name
     * @return The SuggestDeleteResponse
     */
    public SuggestDeleteResponse deleteDocumentWords(final String index) {

| `SuggestItem.java` | Domain model |
| `DefaultContentsParser.java` | Text processing pipeline |

### Key Constants

```java
// Field names (FieldNames.java)
TEXT, READING_PREFIX, QUERY_FREQ, DOC_FREQ, USER_BOOST, KINDS, TIMESTAMP

// Default values
MAX_READING_NUM = 10
PREFIX_MATCH_WEIGHT = 2.0f
EXPECTED_INDEX_COUNT = 1

// Default timeouts
searchTimeout: 15s
indexTimeout: 1m
bulkTimeout: 1m

        Map<String, Object> source = new HashMap<>();
        source.put(FieldNames.TEXT, "test");
        source.put(FieldNames.QUERY_FREQ, 100L);
        source.put(FieldNames.DOC_FREQ, 50L);
        source.put(FieldNames.USER_BOOST, 2.0f);
        source.put(FieldNames.READING_PREFIX + "0", Arrays.asList("reading1"));
        source.put(FieldNames.FIELDS, Arrays.asList("field1"));

        existing.put(FieldNames.DOC_FREQ, 5L);
        existing.put(FieldNames.QUERY_FREQ, 3L);
        existing.put(FieldNames.TIMESTAMP, System.currentTimeMillis());

        Map<String, Object> updated = SuggestItemSerializer.toUpdatedSource(item, existing);

        assertNotNull(updated);
        assertTrue(updated.containsKey(FieldNames.DOC_FREQ));

        map.put(FieldNames.QUERY_FREQ, updatedQueryFreq);

        final long updatedDocFreq = mergeFrequency(existingSource, FieldNames.DOC_FREQ, item.getDocFreq());
        map.put(FieldNames.DOC_FREQ, updatedDocFreq);

        map.put(FieldNames.USER_BOOST, item.getUserBoost());
        map.put(FieldNames.SCORE, (updatedQueryFreq + updatedDocFreq) * item.getUserBoost());

        assertNotNull(map);
        assertEquals("", map.get(FieldNames.TEXT)); // Empty string for empty map
        assertEquals(0L, map.get(FieldNames.QUERY_FREQ));
        assertEquals(0L, map.get(FieldNames.DOC_FREQ));
        assertEquals(1.0f, map.get(FieldNames.USER_BOOST));
        assertNotNull(map.get(FieldNames.READING_PREFIX + "0"));
        assertNotNull(map.get(FieldNames.FIELDS));

                    ScoreFunctionBuilders.weightFactorFunction(prefixMatchWeight)));
        }

        flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(ScoreFunctionBuilders.fieldValueFactorFunction(FieldNames.DOC_FREQ)
                .missing(0.1f)
                .modifier(FieldValueFactorFunction.Modifier.LOG2P)
                .setWeight(1.0F)));

        map.put(FieldNames.LANGUAGES, new String[] {});
        map.put(FieldNames.KINDS, new String[] {});
        map.put(FieldNames.SCORE, 1.0F);
        map.put(FieldNames.QUERY_FREQ, 0L);
        map.put(FieldNames.DOC_FREQ, 0L);
        map.put(FieldNames.USER_BOOST, 1.0F);
        map.put(FieldNames.TIMESTAMP, DateTimeFormatter.ISO_INSTANT.format(ZonedDateTime.now()));
        return map;
    }

    /**

     * Returns the number of document words in the suggestion index.
     * @return The number of document words.
     */
    public long getDocumentWordsNum() {
        return getNum(QueryBuilders.rangeQuery(FieldNames.DOC_FREQ).gte(1));
    }

    /**
     * Returns the number of query words in the suggestion index.
     * @return The number of query words.
     */
    public long getQueryWordsNum() {