final String code = Arrays.stream(langFields)
                .map(s -> "ctx._source['" + s + "_'+ctx._source." + langField + "]=ctx._source." + s)
                .collect(Collectors.joining(";"));
        if (logger.isDebugEnabled()) {
            logger.debug("reindex script: {}", code);
        }
        return "if(ctx._source." + langField + "!=null){" + code + "}";
    }

                    if (StringUtil.isNotBlank(url)) {
                        final Set<String> labelSet = labelTypeHelper.getMatchedLabelValueSet(url);
                        final Script script = languageHelper.createScript(doc, "ctx._source." + fessConfig.getIndexFieldLabel()
                                + "=new String[]{" + labelSet.stream().map(s -> "\"" + s + "\"").collect(Collectors.joining(",")) + "}");
                        return builder.setScript(script);

### Thread-Local Storage

```java
// Set (in CrawlerThread)
CrawlingParameterUtil.setCrawlerContext(context);
CrawlingParameterUtil.setUrlQueue(urlQueue);

// Get (anywhere in same thread)
CrawlerContext ctx = CrawlingParameterUtil.getCrawlerContext();

// Clear (ALWAYS in finally)
CrawlingParameterUtil.clearAll();
```

## Log Message Guidelines

                                        final Script script = ComponentUtil.getLanguageHelper()
                                                .createScript(doc,
                                                        "ctx._source." + fessConfig.getIndexFieldClickCount() + "+=" + count.toString());
                                        final Map<String, Object> upsertMap = new HashMap<>();

                        searchHelper.update(id, builder -> {
                            final Script script = ComponentUtil.getLanguageHelper()
                                    .createScript(doc, "ctx._source." + fessConfig.getIndexFieldFavoriteCount() + "+=1");
                            builder.setScript(script);
                            final Map<String, Object> upsertMap = new HashMap<>();

        final UpdateByQueryRequest request = new UpdateByQueryRequest(index).setQuery(QueryBuilders.idsQuery().addIds(id))
                .setScript(new Script(ScriptType.INLINE, "painless",
                        "ctx._source[params.f]=params.v;" + ComponentUtil.getLanguageHelper().getReindexScriptSource(),
                        Map.of("f", field, "v", value)));
        try {