[ML] Update job service id schema (#67462)

x-pack/plugins/ml/public/application/jobs/jobs_list/components/utils.js

@@ -19,7 +19,7 @@ import { mlCalendarService } from '../../../services/calendar_service';
 export function loadFullJob(jobId) {
   return new Promise((resolve, reject) => {
     ml.jobs
-      .jobs(jobId)
+      .jobs([jobId])
       .then((jobs) => {
         if (jobs.length) {
           resolve(jobs[0]);

x-pack/plugins/ml/server/routes/schemas/job_service_schema.ts

@@ -40,10 +40,8 @@ export const forceStartDatafeedSchema = schema.object({
 });
 
 export const jobIdsSchema = schema.object({
-  /** Optional list of job ID(s). */
-  jobIds: schema.maybe(
-    schema.oneOf([schema.string(), schema.arrayOf(schema.maybe(schema.string()))])
-  ),
+  /** Optional list of job IDs. */
+  jobIds: schema.maybe(schema.arrayOf(schema.maybe(schema.string()))),
 });
 
 export const jobsWithTimerangeSchema = {