Add supported-type tests to avg aggregation (#54011)

Author: csoulios

server/src/test/java/org/elasticsearch/search/aggregations/metrics/AvgAggregatorTests.java

@@ -52,7 +52,9 @@
 import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
 import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregator;
 import org.elasticsearch.search.aggregations.support.AggregationInspectionHelper;
+import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
 import org.elasticsearch.search.aggregations.support.ValueType;
+import org.elasticsearch.search.aggregations.support.ValuesSourceType;
 import org.elasticsearch.search.lookup.LeafDocLookup;
 
 import java.io.IOException;
@@ -709,4 +711,16 @@ public void testScriptCaching() throws IOException {
         directory.close();
         unmappedDirectory.close();
     }
+
+    @Override
+    protected List<ValuesSourceType> getSupportedValuesSourceTypes() {
+        return List.of(
+            CoreValuesSourceType.NUMERIC
+        );
+    }
+
+    @Override
+    protected AggregationBuilder createAggBuilderForTypeTest(MappedFieldType fieldType, String fieldName) {
+        return new AvgAggregationBuilder("foo").field(fieldName);
+    }
 }