[ML] do not throw an error when agg is not supported by UI (#72685) (#…

…72806)

Co-authored-by: Dima Arnautov <dmitrii.arnautov@elastic.co>

x-pack/plugins/transform/public/app/common/pivot_aggs.test.ts

@@ -11,10 +11,6 @@ import {
 } from '../sections/create_transform/components/step_define/common/filter_agg/components';
 
 describe('getAggConfigFromEsAgg', () => {
-  test('should throw an error for unsupported agg', () => {
-    expect(() => getAggConfigFromEsAgg({ terms: {} }, 'test')).toThrowError();
-  });
-
   test('should return a common config if the agg does not have a custom config defined', () => {
     expect(getAggConfigFromEsAgg({ avg: { field: 'region' } }, 'test_1')).toEqual({
       agg: 'avg',

x-pack/plugins/transform/public/app/common/pivot_aggs.ts

@@ -110,8 +110,8 @@ export function getAggConfigFromEsAgg(
   // Find the main aggregation key
   const agg = aggKeys.find((aggKey) => aggKey !== 'aggs');
 
-  if (!isPivotSupportedAggs(agg)) {
-    throw new Error(`Aggregation "${agg}" is not supported`);
+  if (agg === undefined) {
+    throw new Error(`Aggregation key is required`);
   }
 
   const commonConfig: PivotAggsConfigBase = {