Elastic: Support request cancellation properly (Uses new backendSrv.fetch…

Elastic: Support request cancellation properly (Uses new backendSrv.fetch Observable request API) (#30009)

* Elastic: Fixes so templating queries work

* Chore: fixes test

* Fix: fixes getFields from metricFindQuery

* Elastic: Support request cancellation properly

* Refactor: refactors tests

Co-authored-by: Elfo404 <gio.ricci@grafana.com>

public/app/plugins/datasource/elasticsearch/components/QueryEditor/BucketAggregationsEditor/BucketAggregationEditor.tsx

@@ -48,7 +48,7 @@ export const BucketAggregationEditor: FunctionComponent<QueryMetricEditorProps>
       }
     };
 
-    return (await get()).map(toSelectableValue);
+    return (await get().toPromise()).map(toSelectableValue);
   };
 
   return (

public/app/plugins/datasource/elasticsearch/components/QueryEditor/MetricAggregationsEditor/MetricEditor.tsx

@@ -83,7 +83,7 @@ export const MetricEditor: FunctionComponent<Props> = ({ value }) => {
       return datasource.getFields('number');
     };
 
-    return (await get()).map(toSelectableValue);
+    return (await get().toPromise()).map(toSelectableValue);
   };
 
   return (