fix the bug that index field is not getting populated when editing a … (#783)

* fix the bug that index field is not getting populated when editing a detector

Signed-off-by: Jackie Han <jkhanjob@gmail.com>

* update documentation

Signed-off-by: Jackie Han <jkhanjob@gmail.com>

---------

Signed-off-by: Jackie Han <jkhanjob@gmail.com>
(cherry picked from commit 2198a20)

Author: jackiehanyang

public/pages/DefineDetector/components/Datasource/DataSource.tsx

@@ -61,12 +61,11 @@ export function DataSource(props: DataSourceProps) {
   const { setFieldValue } = useFormikContext();
 
   useEffect(() => {
-    setFieldValue('index', []);
-    setFieldValue('timeField', undefined);
-    setFieldValue('filters', []);
-
     const getInitialIndices = async () => {
       await dispatch(getIndices(queryText, dataSourceId));
+      setFieldValue('index', props.formikProps.values.index);
+      setFieldValue('timeField', props.formikProps.values.timeField);
+      setFieldValue('filters', props.formikProps.values.filters);
     };
     getInitialIndices();
   }, [dataSourceId]);

release-notes/opensearch-anomaly-detection-dashboards.release-notes-2.15.0.0.md

@@ -13,6 +13,7 @@ Compatible with OpenSearch Dashboards 2.15.0
 
 * Fix handling of special characters in categorical values ([#757](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/757))
 * Fix Warning Message About Custom Result Index Despite Existing Indices ([#759](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/759))
+* Fix index field not getting populated when editing a detector ([#783](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/783))
 
 ### Maintenance