}

            try {
                final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
                final String index = fessConfig.getIndexDocumentUpdateIndex();
                searchEngineClient.admin().indices().prepareRefresh(index).execute().actionGet();
                final long numOfDeleted = searchEngineClient.deleteByQuery(index, queryBuilder);

                                        upsertMap.put(fessConfig.getIndexFieldClickCount(), count);
                                        return new UpdateRequest(fessConfig.getIndexDocumentUpdateIndex(), id).script(script)
                                                .upsert(upsertMap);
                                    }
                                    return null;
                                })

     * The value is, e.g. fess.update <br>
     * comment: Index name for update documents.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexDocumentUpdateIndex();

    /**
     * Get the value for the key 'index.document.suggest.index'. <br>
     * The value is, e.g. fess <br>
     * comment: Index name for suggest documents.