for (final SuggestItem item : mergedItems) {
            final GetResponse getResponse = client.prepareGet().setIndex(index).setId(item.getId()).get(TimeValue.timeValueSeconds(30));
            if (update && getResponse.isExists()) {
                final IndexRequestBuilder indexRequestBuilder = new IndexRequestBuilder(client, IndexAction.INSTANCE, index);
                indexRequestBuilder.setId(item.getId()).setOpType(IndexRequest.OpType.INDEX)

                    .setExpandWildcardsOpen(expandWildcardsOpen).execute().actionGet(fessConfig.getIndexSearchTimeout());
            return response.isExists();
        } catch (final Exception e) {
            // ignore
        }
        return false;
    }

    public static void deleteIndex(final IndicesAdminClient indicesClient, final String index,

    }

    /**
     * @throws Exception
     */
    public void testIsExist() throws Exception {
        assertEquals("1", true, ResourceUtil.isExist("CLMessages.properties"));
        assertEquals("2", false, ResourceUtil.isExist("hoge"));
    }

    /**
     * @throws Exception
     */
    public void testGetExtension() throws Exception {