*/
    public long deleteByVirtualHost(final String virtualHost) {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String index = fessConfig.getIndexDocumentUpdateIndex();
        return deleteByVirtualHost(searchEngineClient, index, virtualHost);
    }

    /**

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

        final String virtualHost = "aaa";

        assertEquals(1, indexingHelper.deleteByVirtualHost(virtualHost));
        assertEquals("fess.update", resultMap.get("index"));
        assertEquals("virtual_host", resultMap.get("field"));
        assertEquals(virtualHost, resultMap.get("value"));
    }