+ "=new String[]{" + labelSet.stream().map(s -> "\"" + s + "\"").collect(Collectors.joining(",")) + "}");
                        return builder.setScript(script);
                    }
                } catch (final Exception e) {
                    logger.warn("Failed to process {}", hit, e);
                }
                return null;
            });

        }
        final String index = fessConfig.getIndexDocumentUpdateIndex();
        for (final String id : ids) {
            bulkRequestBuilder.add(client.prepareUpdate().setIndex(index).setId(id)
                    .setScript(new Script(ScriptType.INLINE, scriptLang, scriptCode, params)));
        }
        if (bulkRequestBuilder.numberOfActions() > requestCacheSize) {
            flush();
        }
        return (long) ids.length;
    };