this.timestamp = timestamp;
    }

    /**
     * Sets the query frequency of the suggest item.
     * @param queryFreq The query frequency to set.
     */
    public void setQueryFreq(final long queryFreq) {
        this.queryFreq = queryFreq;
    }

    /**
     * Sets the document frequency of the suggest item.
     * @param docFreq The document frequency to set.
     */

        mergedItem.setTimestamp(item2.getTimestamp());
        mergedItem.setUserBoost(item2.getUserBoost());
        mergedItem.setEmptySource(item2.toEmptyMap());

        // Sum frequencies
        mergedItem.setQueryFreq(item1.getQueryFreq() + item2.getQueryFreq());
        mergedItem.setDocFreq(item1.getDocFreq() + item2.getDocFreq());

        return mergedItem;
    }

    /**

        if (logger.isInfoEnabled()) {
            logger.info("Deleting query words: index={}", index);
        }
        return deleteWordsByKind(index, FieldNames.QUERY_FREQ, SuggestItem.Kind.QUERY, item -> item.setQueryFreq(0),
                SuggestItem.Kind.DOCUMENT, SuggestItem.Kind.USER);
    }

    /**
     * Common method to delete words by kind.
     *
     * @param index The index name

        item.setText(text);
        item.setReadings(readings.toArray(new String[readings.size()][]));
        item.setFields(fields.toArray(new String[fields.size()]));
        item.setDocFreq(docFreq);
        item.setQueryFreq(queryFreq);
        item.setUserBoost(userBoost);
        item.setTags(tags.toArray(new String[tags.size()]));
        item.setRoles(roles.toArray(new String[roles.size()]));

        // Test timestamp
        ZonedDateTime now = ZonedDateTime.now();
        item.setTimestamp(now);
        assertEquals(now, item.getTimestamp());

        // Test query frequency
        item.setQueryFreq(200L);
        assertEquals(200L, item.getQueryFreq());

        // Test document frequency
        item.setDocFreq(150L);
        assertEquals(150L, item.getDocFreq());

        // Test user boost