Fix SumAggregationBuilder#build should use the SumAggregation rather than...

Fix SumAggregationBuilder#build should use the SumAggregation rather than MaxAggregation.(#9111) (#9114)
Co-authored-by: Nxishui <xishui@wacai.com>

docs/en/changes/changes.md

@@ -64,6 +64,7 @@
 * [Breaking Change] SQL Database: move `Tags list` from `Segment`,`Logs`,`Alarms` to their additional table.
 * [Breaking Change] Remove `total` field in Trace, Log, Event, Browser log, and alarm list query.
 * Support `OFF_CPU` eBPF Profiling.
+* Fix SumAggregationBuilder#build should use the SumAggregation rather than MaxAggregation.
 
 #### UI
 

oap-server/server-library/library-elasticsearch-client/src/main/java/org/apache/skywalking/library/elasticsearch/requests/search/aggregation/SumAggregationBuilder.java

@@ -37,7 +37,7 @@ public final class SumAggregationBuilder implements AggregationBuilder {
     }
 
     @Override
-    public MaxAggregation build() {
-        return new MaxAggregation(name, field);
+    public SumAggregation build() {
+        return new SumAggregation(name, field);
     }
 }