I have ALB on AWS running on EKS cluster. I'm trying to apply change in Ingress resource on routing so it points to different backend.

The only difference in Ingresses below is spec for backend.

Why is update not working? How to update routing on ALB?

Original ingress:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-ingress
  namespace: default
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/backend-protocol: HTTP
    alb.ingress.kubernetes.io/listen-ports: '[{"HTTP": 80}]'
  labels:
    app: api    
    type: ingress
spec:  
  backend:
    serviceName: api-service
    servicePort: 80 

Update ingress:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-ingress
  namespace: default
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/backend-protocol: HTTP
    alb.ingress.kubernetes.io/listen-ports: '[{"HTTP": 80}]'
  labels:
    app: api    
    type: ingress
spec:  
  backend:
    serviceName: offline-service
    servicePort: 9001 

Controller:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/name: alb-ingress-controller
  name: alb-ingress-controller
  namespace: kube-system
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: alb-ingress-controller
  template:
    metadata:
      labels:
        app.kubernetes.io/name: alb-ingress-controller
    spec:
      containers:
        - name: alb-ingress-controller
          args:           
            - --ingress-class=alb
            - --cluster-name=cluster-22           
          env:           
            - name: AWS_ACCESS_KEY_ID
              value: key           
            - name: AWS_SECRET_ACCESS_KEY
              value: key          
          image: docker.io/amazon/aws-alb-ingress-controller:v1.1.3
      serviceAccountName: alb-ingress-controller