Elasticsearch: Only show numbers in histogram field autocomplete (#38631) (#38652)

(cherry picked from commit b5e4a0a39a)

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

public/app/plugins/datasource/elasticsearch/hooks/useFields.test.tsx

@@ -60,6 +60,11 @@ describe('useFields hook', () => {
     result.current();
     expect(getFields).toHaveBeenLastCalledWith(['date'], timeRange);
 
+    // Histrogram only works on numbers
+    rerender('histogram');
+    result.current();
+    expect(getFields).toHaveBeenLastCalledWith(['number'], timeRange);
+
     // Geohash Grid only works on geo_point data
     rerender('geohash_grid');
     result.current();

public/app/plugins/datasource/elasticsearch/hooks/useFields.ts

@@ -33,6 +33,8 @@ const getFilter = (type: AggregationType) => {
         return ['date'];
       case 'geohash_grid':
         return ['geo_point'];
+      case 'histogram':
+        return ['number'];
       default:
         return [];
     }