final IndicesExistsResponse response = indicesClient.prepareExists(index).setExpandWildcardsClosed(expandWildcardsClosed)
                    .setExpandWildcardsOpen(expandWildcardsOpen).execute().actionGet(fessConfig.getIndexSearchTimeout());
            return response.isExists();
        } catch (final Exception e) {
            // ignore
        }
        return false;
    }