* @return the number of documents that were deleted
     */
    public long deleteDocumentByQuery(final SearchEngineClient searchEngineClient, final QueryBuilder queryBuilder) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return deleteDocumentByQuery(searchEngineClient, fessConfig.getIndexDocumentUpdateIndex(), queryBuilder);
    }

    /**

                final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();
                final long count = indexingHelper.deleteDocumentByQuery(searchEngineClient,
                        QueryBuilders.prefixQuery(fessConfig.getIndexFieldUrl(), url));
                if (logger.isDebugEnabled()) {

                return 0;
            }
        };
        ComponentUtil.register(client, "searchEngineClient");

        final String url = "http://test.com/";

        assertEquals(1, indexingHelper.deleteDocumentByQuery(client, QueryBuilders.termQuery("fess.update", url)));
        assertEquals("fess.update", resultMap.get("index"));
        assertEquals(url, resultMap.get("url"));
    }

    @Test