Description of problem:
Upgrade the logging cluster via OLM, the ES pod isn't upgraded, error message in elasticsearch-operator pod log:
time="2019-04-01T01:57:03Z" level=error msg="error syncing key (openshift-logging/elasticsearch): Failed to reconcile Elasticsearch deployment spec: Unsupported change to UUIDs made: Previously used GenUUID \"79gc79ge\" is no longer found in Spec.Nodes"

elasticsearch CR:
apiVersion: v1
items:
- apiVersion: logging.openshift.io/v1
  kind: Elasticsearch
  metadata:
    creationTimestamp: 2019-04-01T01:10:23Z
    generation: 1
    name: elasticsearch
    namespace: openshift-logging
    ownerReferences:
    - apiVersion: logging.openshift.io/v1
      controller: true
      kind: ClusterLogging
      name: instance
      uid: daacbc46-541a-11e9-872e-0299e54d8204
    resourceVersion: "49196"
    selfLink: /apis/logging.openshift.io/v1/namespaces/openshift-logging/elasticsearches/elasticsearch
    uid: ece23de6-541a-11e9-872e-0299e54d8204
  spec:
    managementState: Managed
    nodeSpec:
      image: quay.io/openshift/origin-logging-elasticsearch5:v4.0
      resources:
        limits:
          cpu: "1"
          memory: 4Gi
        requests:
          cpu: 200m
          memory: 1Gi
    nodes:
    - nodeCount: 2
      resources:
        limits:
          cpu: "1"
          memory: 4Gi
        requests:
          cpu: 200m
          memory: 1Gi
      roles:
      - client
      - data
      - master
      storage:
        size: 10Gi
        storageClassName: gp2
    redundancyPolicy: SingleRedundancy
  status:
    clusterHealth: green
    conditions:
    - lastTransitionTime: 2019-04-01T01:57:03Z
      message: Previously used GenUUID "79gc79ge" is no longer found in Spec.Nodes
      reason: Invalid Spec
      status: "True"
      type: InvalidUUID

Other pods are upgraded successfully. The differences between these two csv versions is the container image tag, in 4.2.0, the tag is "v4.0"
$ oc get csv
NAME                            DISPLAY                  VERSION   REPLACES                        PHASE
clusterlogging.v4.2.0           Cluster Logging          4.2.0     clusterlogging.v4.1.0           Succeeded
elasticsearch-operator.v4.2.0   Elasticsearch Operator   4.2.0     elasticsearch-operator.v4.1.0   Succeeded

Version-Release number of selected component (if applicable):
quay.io/openshift/origin-elasticsearch-operator@sha256:03cf12040145c6c862726c732942cda0f8d3b3bd8d9fedf583911be10b4e7756

How reproducible:
Always

Steps to Reproduce:
1. Deploy logging via OLM
2. upgrade logging via OLM
the new csv files are:
https://raw.githubusercontent.com/QiaolingTang/logging/master/cluster-logging-bundle.yaml
https://raw.githubusercontent.com/QiaolingTang/logging/master/elasticsearch-operator-bundle.yaml
3.

Actual results:
The es pod isn't upgraded.

Expected results:


Additional info: