if (doc.get(fessConfig.getIndexFieldConfigId()) instanceof final String configId) {
                crawlingConfigHelper.getPipeline(configId).ifPresent(s -> builder.setPipeline(s));
            }
        });
        return asJson(new ApiBulkResponse().items(Arrays.stream(response.getItems()).map(item -> {
            final Map<String, Object> itemMap = new HashMap<>();

                            final String configId = (String) doc.get(fessConfig.getIndexFieldConfigId());
                            crawlingConfigHelper.getPipeline(configId).ifPresent(s -> builder.setPipeline(s));
                        });
                if (response.hasFailures()) {
                    if (logger.isDebugEnabled()) {

        assertTrue(crawlingConfigHelper.getPipeline(null).isEmpty());
        assertTrue(crawlingConfigHelper.getPipeline("").isEmpty());
        assertTrue(crawlingConfigHelper.getPipeline("XXX").isEmpty());
        assertTrue(crawlingConfigHelper.getPipeline("W1").isEmpty());
        assertTrue(crawlingConfigHelper.getPipeline("F1").isEmpty());
        assertTrue(crawlingConfigHelper.getPipeline("D1").isEmpty());

        } catch (final Exception e) {
            logger.warn("Failed to access a crawling config cache: {}", configId, e);
            return null;
        }
    }

    public OptionalThing<String> getPipeline(final String configId) {
        final CrawlingConfig config = getCrawlingConfig(configId);
        if (config == null) {
            return OptionalThing.empty();
        }