solr 搜索 多字段高亮不显示

[丶橙子]

使用solrj 搜索实现,但是多字段高亮不显示

servic中:

		//高亮显示
		//开启高亮
		solrQuery.setHighlight(true);
		//设置高亮字段
		solrQuery.addHighlightField("document_TITLEPROPER");
		solrQuery.addHighlightField("document_ABSTRACT");
		solrQuery.addHighlightField("document_DESCRIPTOR");
		solrQuery.addHighlightField("document_RECORDNO");
		//启用多字段高亮
		solrQuery.set("hl.highlightMultiTerm","true");
		//设置高亮前缀
	        solrQuery.setHighlightSimplePre("<font color='red'>");
		//设置高亮后缀
		solrQuery.setHighlightSimplePost("</font>");
		//设置默认查询
		solrQuery.set("df", "document_keywords");
		
		//调用dao方法,执行搜索查询
		SearchPageBean pageBean = DocumentsDao.queryIndexWithSolr(solrQuery);

dao:

		//获取高亮显示
		Map<String, Map<String, List<String>>> highlighting = response.getHighlighting();
		 
		if(highlighting != null){
		 	//标题
			List<String> list = highlighting.get(sdoc.get("id")).get("document_TITLEPROPER");
			//摘要	
			List<String> list2 = highlighting.get(sdoc.get("id")).get("document_ABSTRACT");
			//关键字 
			List<String> list3 = highlighting.get(sdoc.get("id")).get("document_DESCRIPTOR");
		 	// 文本
		 	List<String> list4 = highlighting.get(sdoc.get("id")).get("document_RECORDNO");
		 	
			if(list != null && list.size() > 0){
				d.setTITLEPROPER(list.get(0));
			} else {
				d.setTITLEPROPER(String.valueOf(sdoc.get("document_TITLEPROPER")));
			}
		   					
			if(list2 != null && list2.size() > 0){
				d.setABSTRACT(list2.get(0));
			} else {
				d.setABSTRACT(String.valueOf(sdoc.get("document_ABSTRACT")));
			}
			
			if(list3 != null && list3.size() > 0){
				d.setDESCRIPTOR(list3.get(0));
			} else {
				d.setDESCRIPTOR(String.valueOf(sdoc.get("document_DESCRIPTOR")));
			}
			
			if(list4 != null && list4.size() > 0){
				d.setRECORDNO(list4.get(0));
			} else {
				d.setRECORDNO(String.valueOf(sdoc.get("document_RECORDNO")));
			}
		
			
		} else {
			d.setTITLEPROPER(String.valueOf(sdoc.get("document_TITLEPROPER")));
			d.setABSTRACT(String.valueOf(sdoc.get("document_ABSTRACT")));
			d.setDESCRIPTOR(String.valueOf(sdoc.get("document_DESCRIPTOR")));
			d.setRECORDNO(String.valueOf(sdoc.get("document_RECORDNO")));
		}

Map<String, Map<String, List<String>>> highlighting = response.getHighlighting();
highlighting 中的 map值是空的
{650412={}, 44295={}, 878002={}, 234877={}, 693562={}, 648903={}, 650416={}, 647868={}, 311390={}, 650953={}, 650952={}, 648573={}, 147940={}, 650853={}, 650999={}, 814466={}, 650249={}, 588778={}}