CubeOpenSearchRequest request = new CubeOpenSearchRequest();
        request.setQueryString("ti:汽车 AND ls='ls2af:(江苏)'");
        request.setSource(15);
        request.setLevel(ApiLevel.ONE);
        request.setPageIndex(1);
        request.setPageSize(1);
        request.setSortField(PatField.ApplicationNumber);
        request.setFieldOrder(FieldOrder.DESC);
        CubePatentSearchResponse response = CLIENT.execute(request);
        List<Document<PatField>> documents = response.getDocuments();
        long totalHits = response.getTotalHits();
                            
                        

                            
    "documents":[
		{
			"fieldValues":{
				"an":"CN200730035701.X",
				"ad":"20070531",
				"pn":"CN300772437",
				"pd":"20080430",
				"ti":"汽车倒车雷达显示器",
				"pa":[
					"徐福芳"
				],
				"id":"CN200730035701.X"
			},
			"hlFieldValues":{
				"pa":[
					"徐福芳"
				],
				"ad":[
					"20070531"
				],
				"pd":[
					"20080430"
				],
				"ti":[
					"<span class=\"c-highligth-default\">汽</span><span class=\"c-highligth-default\">车</span>倒车雷达显示器"
				],
				"id":[
					"CN200730035701.X"
				],
				"an":[
					"CN200730035701.X"
				],
				"pn":[
					"CN300772437"
				]
			}
		}
	],
	"groupedHits":0,
	"qTime":26360,
	"success":true,
	"totalHits":162

                            
                        

                            
    {
       "errorCode":"500",
       "groupedHits":0,
       "msg":"patFields cannot be empty or null!",
       "qTime":0,
       "success":false,
       "totalHits":0
    }