public Long getVersionNo() {
        return asDocMeta().version();
    }

    public void setVersionNo(final Long version) {
        asDocMeta().version(version);
    }

    public void addSearchFieldLogValue(final String name, final String value) {
        if (StringUtil.isNotBlank(name) && StringUtil.isNotBlank(value)) {
            searchFieldLogList.add(new Pair<>(name, value));
        }
    }

                for (final Map.Entry<String, List<String>> logEntry : fieldLogMap.entrySet()) {
                    for (final String value : logEntry.getValue()) {
                        searchLog.addSearchFieldLogValue(logEntry.getKey(), StringUtils.abbreviate(value, queryMaxLength));
                    }
                }
            }

            for (final String s : fessConfig.getSearchlogRequestHeadersAsArray()) {