}

    /**
     * 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() {

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

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

        assertEquals(3, suggester.getAllWordsNum());

        SuggestWriterResult result =
                writer.deleteByQuery(runner.client(), suggester.settings(), suggester.getIndex(), QueryBuilders.matchAllQuery());

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

        runner.refresh();

        assertEquals(0, suggester.getAllWordsNum());
    }

    @Test

    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);

        if (logger.isInfoEnabled()) {
            logger.info("Deleting all suggest items: index={}", index);
        }
        final SuggestDeleteResponse response = deleteByQuery(QueryBuilders.matchAllQuery());
        restoreElevateWord();
        return response;
    }

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