final char c = path.charAt(i);
                if (CharUtil.isUrlChar(c) || c == '^' || c == '{' || c == '}' || c == '|' || c == '\\') {
                    buf.append(c);
                } else {
                    buf.append(URLEncoder.encode(String.valueOf(c), filterPathEncoding));
                }
            }
            return buf.toString();
        } catch (final UnsupportedEncodingException e) {

            if (client.existsIndex(index)) {
                if (client.deleteIndex(index)) {
                    logger.warn("Deleted {}.", index);
                } else {
                    logger.warn("Failed to delete {}.", index);
                }
            } else if (logger.isDebugEnabled()) {
                logger.debug("{} does not exist.", index);
            }
        }
    }