[ML] Fixing "aggs" use in datafeeds (#56002) (#56016)

* [ML] Fixing "aggs" use in datafeeds

* removing use of Record

x-pack/legacy/plugins/ml/public/application/jobs/new_job/common/job_creator/configs/datafeed.ts

@@ -11,6 +11,7 @@ export type DatafeedId = string;
 export interface Datafeed {
   datafeed_id: DatafeedId;
   aggregations?: Aggregation;
+  aggs?: Aggregation;
   chunking_config?: ChunkingConfig;
   frequency?: string;
   indices: IndexPatternTitle[];
@@ -33,6 +34,7 @@ interface Aggregation {
       field: string;
       fixed_interval: string;
     };
-    aggregations: Record<string, any>;
+    aggregations?: { [key: string]: any };
+    aggs?: { [key: string]: any };
   };
 }

x-pack/legacy/plugins/ml/public/application/jobs/new_job/common/job_creator/job_creator.ts

@@ -623,8 +623,10 @@ export class JobCreator {
     }
 
     this._aggregationFields = [];
-    if (this._datafeed_config.aggregations?.buckets !== undefined) {
-      collectAggs(this._datafeed_config.aggregations.buckets, this._aggregationFields);
+    const buckets =
+      this._datafeed_config.aggregations?.buckets || this._datafeed_config.aggs?.buckets;
+    if (buckets !== undefined) {
+      collectAggs(buckets, this._aggregationFields);
     }
   }
 }

x-pack/legacy/plugins/ml/public/application/jobs/new_job/common/job_creator/util/general.ts

@@ -325,7 +325,7 @@ export function collectAggs(o: any, aggFields: Field[]) {
     if (o[i] !== null && typeof o[i] === 'object') {
       if (i === 'aggregations' || i === 'aggs') {
         Object.keys(o[i]).forEach(k => {
-          if (k !== 'aggregations' && i !== 'aggs') {
+          if (k !== 'aggregations' && k !== 'aggs') {
             aggFields.push({
               id: k,
               name: k,