[Reporting] Allow csvV2 export type to run with a custom paging strategy (#175748)

## Summary

Follows https://github.com/elastic/kibana/pull/174980

This PR updates the "task payload" data of the "new" CSV export type to
allow the `scroll` option as a method for paging the search when
generating the CSV report.

packages/kbn-generate-csv/index.ts

@@ -8,4 +8,3 @@
 
 export { CsvGenerator } from './src/generate_csv';
 export { CsvESQLGenerator, type JobParamsCsvESQL } from './src/generate_csv_esql';
-export type { CsvPagingStrategy } from './types';

packages/kbn-reporting/common/types.ts

@@ -55,6 +55,11 @@ export interface ReportOutput extends TaskRunResult {
   size: number;
 }
 
+/**
+ * @see also {@link packages/kbn-reporting/common/types.ts}
+ */
+export type CsvPagingStrategy = 'pit' | 'scroll';
+
 /**
  * @deprecated
  */
@@ -64,7 +69,7 @@ export interface BaseParams {
   title: string;
   version: string; // to handle any state migrations
   layout?: LayoutParams; // png & pdf only
-  pagingStrategy?: 'pit' | 'scroll'; // csv only
+  pagingStrategy?: CsvPagingStrategy; // csv only
 }
 
 /**

packages/kbn-reporting/export_types/csv/csv_searchsource.ts

@@ -10,7 +10,7 @@ import { Writable } from 'stream';
 
 import type { DataPluginStart } from '@kbn/data-plugin/server/plugin';
 import type { DiscoverServerPluginStart } from '@kbn/discover-plugin/server';
-import { CsvGenerator, type CsvPagingStrategy } from '@kbn/generate-csv';
+import { CsvGenerator } from '@kbn/generate-csv';
 import {
   CancellationToken,
   LICENSE_TYPE_BASIC,
@@ -20,7 +20,7 @@ import {
   LICENSE_TYPE_PLATINUM,
   LICENSE_TYPE_TRIAL,
 } from '@kbn/reporting-common';
-import { TaskInstanceFields } from '@kbn/reporting-common/types';
+import { CsvPagingStrategy, TaskInstanceFields } from '@kbn/reporting-common/types';
 import {
   CSV_JOB_TYPE,
   CSV_REPORT_TYPE,

packages/kbn-reporting/export_types/csv/csv_v2.ts

@@ -93,7 +93,10 @@ export class CsvV2ExportType extends ExportType<
     const locatorClient = await discoverPluginStart.locator.asScopedClient(req);
     const title = jobParams.title || (await locatorClient.titleFromLocator(params));
 
-    return { ...jobParams, title, objectType: 'search', isDeprecated: false };
+    const objectType = 'search' as const;
+    const pagingStrategy = this.config.csv.scroll.strategy;
+
+    return { ...jobParams, title, objectType, pagingStrategy };
   };
 
   public runTask = async (

packages/kbn-reporting/export_types/csv_common/index.ts

@@ -12,6 +12,7 @@ import type {
   BaseParamsV2,
   BasePayload,
   BasePayloadV2,
+  CsvPagingStrategy,
 } from '@kbn/reporting-common/types';
 
 export * from './constants';
@@ -41,7 +42,10 @@ interface CsvFromSavedObjectBase {
 export type JobParamsCsvFromSavedObject = CsvFromSavedObjectBase &
   Omit<BaseParamsV2, 'title'> & { title?: string };
 
-export type TaskPayloadCsvFromSavedObject = CsvFromSavedObjectBase & BasePayloadV2;
+export interface TaskPayloadCsvFromSavedObject extends CsvFromSavedObjectBase, BasePayloadV2 {
+  objectType: 'search';
+  pagingStrategy: CsvPagingStrategy;
+}
 
 export const CSV_REPORTING_ACTION = 'downloadCsvReport';
 

packages/kbn-reporting/server/export_type.ts

@@ -55,7 +55,7 @@ export abstract class ExportType<
   abstract jobContentEncoding?: 'base64' | 'csv';
   abstract jobContentExtension: 'pdf' | 'png' | 'csv';
 
-  abstract createJob: CreateJobFn<JobParamsType>;
+  abstract createJob: CreateJobFn<JobParamsType, TaskPayloadType>;
   abstract runTask: RunTaskFn<TaskPayloadType>;
 
   abstract validLicenses: LicenseType[];