final String[] targets = fessConfig.getThumbnailGeneratorTargetsAsArray();
        final List<ThumbnailQueue> list = new ArrayList<>();
        taskList.stream().filter(entity -> entity != null).forEach(task -> {
            for (final String target : targets) {
                final ThumbnailQueue entity = new ThumbnailQueue();
                entity.setGenerator(task.getValue1());
                entity.setThumbnailId(task.getValue2());