// cache
                    putResultDataBody(dataMap, fessConfig.getIndexFieldCache(), new String(InputStreamUtil.getBytes(is), charSet));
                    putResultDataBody(dataMap, fessConfig.getIndexFieldHasCache(), Constants.TRUE);
                } catch (final Exception e) {
                    logger.warn("Failed to write cache: sessionId={}, responseData={}", sessionId, responseData, e);
                }