Graduate ElasticIndexedJob to GA

Author: ahg-g

content/en/docs/concepts/workloads/controllers/job.md

@@ -1004,13 +1004,11 @@ observe that pods from a Job are stuck with the tracking finalizer.
 
 ### Elastic Indexed Jobs
 
-{{< feature-state for_k8s_version="v1.27" state="beta" >}}
+{{< feature-state feature_gate_name="ElasticIndexedJob" >}}
 
 You can scale Indexed Jobs up or down by mutating both `.spec.parallelism` 
 and `.spec.completions` together such that `.spec.parallelism == .spec.completions`. 
-When the `ElasticIndexedJob`[feature gate](/docs/reference/command-line-tools-reference/feature-gates/)
-on the [API server](/docs/reference/command-line-tools-reference/kube-apiserver/)
-is disabled, `.spec.completions` is immutable.
+When scaling down, Kubernetes removes the Pods with higher indexes.
 
 Use cases for elastic Indexed Jobs include batch workloads which require 
 scaling an indexed Job, such as MPI, Horovord, Ray, and PyTorch training jobs.

content/en/docs/reference/command-line-tools-reference/feature-gates/elastic-indexed-job.md

@@ -9,6 +9,10 @@ stages:
   - stage: beta
     defaultValue: true
     fromVersion: "1.27"
+    toVersion: "1.30"
+  - stage: stable
+    defaultValue: true
+    fromVersion: "1.31"
 ---
 Enables Indexed Jobs to be scaled up or down by mutating both
 `spec.completions` and `spec.parallelism` together such that `spec.completions == spec.parallelism`.