I am trying to add Elasticsearch to the EKS cluster. But whenever I apply the changes my data is lost. It looks like volume I have attached has been changed and reclaimed.

metadata:
  name: elasticsearch-uat
  labels:
    component: elasticsearch-uat
spec:
  replicas: 1
  serviceName: elasticsearch-uat
  template: 
    metadata:
      ...
    spec:
      initContainers: 
      - name: init-sysctl
        ...
      containers:
      - name: es 
        securityContext:
          capabilities:
            add:
              - IPC_LOCK
        image: 559076975273.dkr.ecr.us-west-2.amazonaws.com/elasticsearch-s3:v2
        env:
        ...
        ports:
        - containerPort: 9200
          name: http
          protocol: TCP
        - containerPort: 9300
          name: transport
          protocol: TCP
        volumeMounts: 
        - mountPath: /data
          name: es-storage-uat
  updateStrategy:
    type: RollingUpdate
  volumeClaimTemplates:
  - metadata:
      namespace: k8
      name: es-storage-uat
    spec:
      storageClassName: gp2
      accessModes: [ ReadWriteOnce ]
      resources:
        requests:
          storage: 2Gi

This is a statefulset

Please help me to understand this concept. I do not want my data to loose in any condition.

Thanks in advance.