indexName = configIndex.replaceFirst(Pattern.quote(CONFIG_INDEX_PREFIX), name);
                    } else {
                        throw new FessSystemException("Unknown config index: " + configIndex);
                    }
                    final boolean exists = existsIndex(indexName);
                    if (!exists) {
                        createIndex(configIndex, indexName);

            writeJsonResponse(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }
    }

    protected String detailedMessage(final Throwable t) {
        if (t == null) {
            return "Unknown";
        }
        Throwable target = t;
        if (target.getCause() == null) {
            return target.getClass().getSimpleName() + "[" + target.getMessage() + "]";
        }

                        // - the specification does not clearly require that (it does for SMB3+)
                        // - there seem to be server implementations (known: EMC Isilon) that do not sign the final
                        // response
                        if ( negoResp.getSelectedDialect().atLeast(DialectVersion.SMB300) || response.isSigned() ) {

             * If any of the above fail, isExists will not be set true
             */

            this.isExists = true;

        }
        catch ( UnknownHostException uhe ) {
            log.debug("Unknown host", uhe);
        }
        catch ( SmbException se ) {
            log.trace("exists:", se);
            switch ( se.getNtStatus() ) {
            case NtStatus.NT_STATUS_NO_SUCH_FILE: