[BUG][Opensearch Dashboards] Chart does not install on EKS v1.19+

[smlx]

Describe the bug
The chart does not install on EKS v1.19+ if you have ingress enabled.

To Reproduce
Steps to reproduce the behavior:

1. Apply the chart to the EKS cluster with ingress enabled.
2. See error.

$ helm --kube-version=v1.20.7-eks-d88609 template --set ingress.enabled=true --namespace dashboards dashboards  ./charts/opensearch-dashboards/ | kubectl apply --dry-run=server -f -
serviceaccount/dashboards-opensearch-dashboards-dashboards created (server dry run)
rolebinding.rbac.authorization.k8s.io/dashboards-opensearch-dashboards-dashboards-rolebinding created (server dry run)
service/dashboards-opensearch-dashboards created (server dry run)
deployment.apps/dashboards-opensearch-dashboards created (server dry run)
error: error validating "STDIN": error validating data: [ValidationError(Ingress.spec.rules[0].http.paths[0].backend): unknown field "serviceName" in io.k8s.api.networking.v1.IngressBackend, ValidationError(Ingress.spec.rules[0].http.paths[0].backend): unknown field "servicePort" in io.k8s.api.networking.v1.IngressBackend]; if you choose to ignore these errors, turn validation off with --validate=false

Expected behavior
Ingress object should be valid.

Chart Name
Opensearch Dashboards

Screenshots
n/a

Host/Environment (please complete the following information):

• Helm Version: v3.6.2
• Kubernetes Version: 1.20.7

Additional context
n/a