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                            20 WrapperQuery
                            实现方式理论基础


Wrapper Query 官网说明


https://www.elastic.co/guide/en/elasticsearch/reference/6.4/query-dsl-wrapper-query.html


This query is more useful in the context of the Java high-level REST client or transport client to also accept queries as json formatted string. In these cases queries can be specified as a json or yaml formatted string or as a query builder (which is a available in the Java high-level REST client).


GET /_search
{
    "query" : {
        "wrapper": {
            "query" : "eyJ0ZXJtIiA6IHsgInVzZXIiIDogIktpbWNoeSIgfX0=" // Base64 encoded string: {"term" : { "user" : "Kimchy" }}
        }
    }
}



将DSL JSON语句 转成 map


https://blog.csdn.net/qq_41370896/article/details/83658948

String dsl = "";
Map maps = (Map)JSON.parse(dsl);  
maps.get("query");// dsl query string



Java 代码


https://blog.csdn.net/tcyzhyx/article/details/84566734

https://www.jianshu.com/p/216ca70d9e62

StringBuffer dsl = new StringBuffer();
dsl.append("{\"bool\": {");
dsl.append("      \"must\": [");
dsl.append("        {");
dsl.append("          \"term\": {");
dsl.append("            \"mdid.keyword\": {");
dsl.append("              \"value\": \"2fa9d41e1af460e0d47ce36ca8a98737\"");
dsl.append("            }");
dsl.append("          }");
dsl.append("        }");
dsl.append("      ]");
dsl.append("    }");
dsl.append("}");
WrapperQueryBuilder wqb = QueryBuilders.wrapperQuery(dsl.toString());
SearchResponse searchResponse = client.prepareSearch(basicsysCodeManager.getYjzxYjxxIndex())
.setTypes(basicsysCodeManager.getYjzxYjxxType()).setQuery(wqb).setSize(10).get();
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit : hits){
	String content = hit.getSourceAsString();
	System.out.println(content);
}



query + agg 应该怎么写


http://www.itkeyword.com/doc/1009692843717298639/wrapperquerybuilder-aggs-query-throwing-query-malformed-exception

"{\"query\":{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"}}}}"
SearchSourceBuilder ssb = new SearchSourceBuilder();

// add the query part
String query ="{\"match_all\": {}}";
WrapperQueryBuilder wrapQB = new WrapperQueryBuilder(query);
ssb.query(wrapQB);

// add the aggregation part
AvgBuilder avgAgg = AggregationBuilders.avg("avg1").field("age");
ssb.aggregation(avgAgg);


实现示例

略