WrapperQueryBuilder - aggs query throwing Query Malformed exception

Question

I have a Json query string:
"\"query\":{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"} } }";

When query is executed via Jest Client, aggregation values are available.

But when this query is converted into a Query Builder (WrapperQueryBuilder) object, getting the following exception.

; nested: QueryParsingException[[st1index] [_na] query malformed, must start with start_object]; }{[ixJ-6RHNR5C6fC7HfJHqaw][st1index][4]: SearchParseException[[st1index][4]: from[-1],size[-1]: Parse Failure [Failed to parse source [{
  "query" : {
    "wrapper" : {
      "query" : "InF1ZXJ5Ijp7Im1hdGNoX2FsbCI6IHt9fSwiYWdncyI6eyJhdmcxIjp7ImF2ZyI6eyJmaWVsZCI6ImFnZSJ9IH0gfQ=="
    }
  }
}]]]; nested: QueryParsingException[[st1index] [_na] query malformed, must start with start_object]; }]

How do i fix this?

Edit 1: Code analysis: Code analysis details added:

    public static void main(String[] args) throws Exception 
{
try{
    //Jest client building
            JestClientFactory factory = new JestClientFactory();
            HttpClientConfig config = new HttpClientConfig.
                    Builder("http://localhost:9201")
                    .connTimeout(10000)
                    .readTimeout(10000)
                    .multiThreaded(true).build();

            factory.setHttpClientConfig(config);
            JestClient jestClient = factory.getObject();

            String query ="{\"query\":{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"} } }}";
             String query2 ="{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"} } }}";

            WrapperQueryBuilder wrapQB = new WrapperQueryBuilder(query2);
            SearchSourceBuilder ssb = new SearchSourceBuilder();
            ssb.query(wrapQB);

//working code commented
            //   Search.Builder searchBuilder = new Search.Builder(query).addIndex("st1index").addType("st1type");

//code which needs to be fixed
            Search.Builder searchBuilder = new 
Search.Builder(ssb.toString()).addIndex("st1index").addType("st1type");
            SearchResult result = jestClient.execute(searchBuilder.build());
            System.out.println(result.getJsonString());
            }
            catch(Exception e)
            {
                System.out.println("inside exception block");
                e.printStackTrace();
            }

        }

with String query and with commented SearchSourceBuilder, aggs results are displayed. But by using WrapperQueryBuilder , unable to retrieve aggs results

Answer 1

You're almost there, you're simply missing enclosing braces:

"{\"query\":{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"}}}}";
 ^                                                                               ^
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this one...                                                         ...and this one

UPDATE

In the WrapperQueryBuilder, you can only pass the content of the query part, and not the aggregations part. You need to add the aggregation part directly on the SearchSourceBuilderlike this:

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);