public class RelatedContentService extends FessAppService {

    @Resource
    protected RelatedContentBhv relatedContentBhv;

    @Resource
    protected FessConfig fessConfig;

    public List<RelatedContent> getRelatedContentList(final RelatedContentPager relatedContentPager) {

        final PagingResultBean<RelatedContent> relatedContentList = relatedContentBhv.selectPage(cb -> {

        });
    }

    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "relatedContentItems", relatedContentService.getRelatedContentList(relatedContentPager)); // page navi

        // restore from pager
        copyBeanToBean(relatedContentPager, form, op -> op.include("term", "content"));
    }

        validateApi(body, messages -> {});
        final RelatedContentPager pager = copyBeanToNewBean(body, RelatedContentPager.class);
        final List<RelatedContent> list = relatedContentService.getRelatedContentList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))