cleanup: remove check for GA feature gate

Author: aojea

pkg/registry/core/pod/strategy.go

@@ -35,11 +35,9 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	utilnet "k8s.io/apimachinery/pkg/util/net"
 	"k8s.io/apimachinery/pkg/util/validation/field"
-	genericfeatures "k8s.io/apiserver/pkg/features"
 	"k8s.io/apiserver/pkg/registry/generic"
 	"k8s.io/apiserver/pkg/storage"
 	"k8s.io/apiserver/pkg/storage/names"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	podutil "k8s.io/kubernetes/pkg/api/pod"
@@ -293,12 +291,9 @@ func NodeNameIndexFunc(obj interface{}) ([]string, error) {
 
 // Indexers returns the indexers for pod storage.
 func Indexers() *cache.Indexers {
-	if utilfeature.DefaultFeatureGate.Enabled(genericfeatures.SelectorIndex) {
-		return &cache.Indexers{
-			storage.FieldIndex("spec.nodeName"): NodeNameIndexFunc,
-		}
+	return &cache.Indexers{
+		storage.FieldIndex("spec.nodeName"): NodeNameIndexFunc,
 	}
-	return nil
 }
 
 // ToSelectableFields returns a field set that represents the object