title: Top Hits Aggregation support in Jest SearchResult
body: <p>I am using below function to make aggregation query:</p>
  
  <pre><code>private TermsBuilder getAggregations(String[] outputFields) {
  
          TermsBuilder topLevelAggr = AggregationBuilders.terms("level1").field("field1").size(0);
          TermsBuilder aggr2 = AggregationBuilders.terms("level2").field("field2").size(0);
          TermsBuilder aggr3 = AggregationBuilders.terms("level3").field("field3").size(0);
          TermsBuilder aggr4 = AggregationBuilders.terms("level4").field("field4").size(0);
          TopHitsBuilder topHitsBuilder = AggregationBuilders.topHits("doc").setSize(1).addSort("fieldValue", SortOrder.DESC);
  
          aggr4.subAggregation(topHitsBuilder);
          aggr3.subAggregation(aggr4);
          aggr2.subAggregation(aggr3);
          topLevelAggr.subAggregation(aggr2);
          topHitsBuilder.setFetchSource(outputFields, new String[]{});
  
          return topLevelAggr;
      }
  </code></pre>
  
  <p>I am getting the correct aggregation query from this code, but after executing the query I am not able to extract the <code>top_hits</code> aggregation result. I am using 
  <code>io.searchbox.core.SearchResult</code> class to get the query result. In this class I couldn't find any support for Top_Hits aggregation.</p>
  
  <p>Please help. Thanks.</p>