trace query start_time desc (#1106)

apm-collector/apm-collector-storage/collector-storage-es-provider/src/main/java/org/apache/skywalking/apm/collector/storage/es/dao/ui/SegmentDurationEsUIDAO.java

@@ -36,6 +36,7 @@ import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.index.query.RangeQueryBuilder;
 import org.elasticsearch.search.SearchHit;
+import org.elasticsearch.search.sort.SortOrder;
 
 /**
  * @author peng-yongsheng
@@ -81,6 +82,7 @@ public class SegmentDurationEsUIDAO extends EsDAO implements ISegmentDurationUID
             boolQueryBuilder.must().add(QueryBuilders.termQuery(SegmentDurationTable.APPLICATION_ID.getName(), applicationId));
         }
 
+        searchRequestBuilder.addSort(SegmentDurationTable.START_TIME.getName(), SortOrder.DESC);
         searchRequestBuilder.setSize(limit);
         searchRequestBuilder.setFrom(from);