}

    /**
     * Returns the total number of words in the suggestion index.
     * @return The total number of words.
     */
    public long getAllWordsNum() {
        return getNum(QueryBuilders.matchAllQuery());
    }

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

        doMatchAll(opLambda);
    }

    protected void doMatchAll(ConditionOptionCall<MatchAllQueryBuilder> opLambda) {
        MatchAllQueryBuilder builder = QueryBuilders.matchAllQuery();
        regQ(builder);
        if (opLambda != null) {
            opLambda.callback(builder);
        }
    }

    // ===================================================================================

        doMatchAll(opLambda);
    }

    protected void doMatchAll(ConditionOptionCall<MatchAllQueryBuilder> opLambda) {
        MatchAllQueryBuilder builder = QueryBuilders.matchAllQuery();
        regQ(builder);
        if (opLambda != null) {
            opLambda.callback(builder);
        }
    }

    // ===================================================================================

        doMatchAll(opLambda);
    }

    protected void doMatchAll(ConditionOptionCall<MatchAllQueryBuilder> opLambda) {
        MatchAllQueryBuilder builder = QueryBuilders.matchAllQuery();
        regQ(builder);
        if (opLambda != null) {
            opLambda.callback(builder);
        }
    }

    // ===================================================================================

        try {
            final QueryBuilder queryBuilder;
            if (Strings.isNullOrEmpty(q)) {
                queryBuilder = QueryBuilders.matchAllQuery();
            } else {
                final boolean prefixQuery = !q.endsWith(" ") && !q.endsWith("　");
                List<String> readingList = new ArrayList<>();

            if (queryBuilder != null) {
                queryContext.setQueryBuilder(queryBuilder);
            } else {
                queryContext.setQueryBuilder(QueryBuilders.matchAllQuery());
            }
            // TODO options query
            context.accept(queryContext);
        } catch (final QueryParseException e) {

    public void testDeleteByQueryWithInvalidIndex() {
        // Test delete with non-existent index
        SuggestUtil.deleteByQuery(client, settings, "nonexistent_index", QueryBuilders.matchAllQuery());
    }

    @Test
    public void testDeleteScrollContext() {
        // Test with null scrollId (should not throw exception)
        SuggestUtil.deleteScrollContext(client, null);

                    .setField(fessConfig.getIndexFieldDocId())));
            reader.setQuery(QueryBuilders
                    .functionScoreQuery(QueryBuilders.matchAllQuery(),
                            flist.toArray(new FunctionScoreQueryBuilder.FilterFunctionBuilder[flist.size()]))
                    .boostMode(CombineFunction.MULTIPLY));

            }
        };
        ComponentUtil.register(client, "searchEngineClient");

        final List<Map<String, Object>> documents = indexingHelper.getDocumentListByQuery(client, QueryBuilders.matchAllQuery(), null);
        assertEquals("fess.update", resultMap.get("index"));
        assertEquals("{\"size\":1,\"query\":{\"match_all\":{\"boost\":1.0}}}", resultMap.get("query"));
        assertEquals(1, documents.size());

    /**
     * Deletes all suggest items.
     * @return The SuggestDeleteResponse.
     */
    public SuggestDeleteResponse deleteAll() {
        final SuggestDeleteResponse response = deleteByQuery(QueryBuilders.matchAllQuery());
        restoreElevateWord();
        return response;
    }

    /**
     * Deletes document words.
     * @return The SuggestDeleteResponse.
     */