[elasticsearch] Add compatibility for k8s 1.16

elasticsearch/templates/_helpers.tpl

@@ -47,3 +47,25 @@ We truncate at 63 chars because some Kubernetes name fields are limited to this
   {{- end -}}
 {{- end -}}
 {{- end -}}
+
+{{/*
+Return the appropriate apiVersion for statefulset.
+*/}}
+{{- define "elasticsearch.statefulset.apiVersion" -}}
+{{- if semverCompare "<1.9-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "apps/v1beta2" -}}
+{{- else -}}
+{{- print "apps/v1" -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Return the appropriate apiVersion for ingress.
+*/}}
+{{- define "elasticsearch.ingress.apiVersion" -}}
+{{- if semverCompare "<1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "extensions/v1beta1" -}}
+{{- else -}}
+{{- print "networking.k8s.io/v1beta1" -}}
+{{- end -}}
+{{- end -}}

elasticsearch/templates/ingress.yaml

@@ -2,7 +2,7 @@
 {{- $fullName := include "uname" . -}}
 {{- $servicePort := .Values.httpPort -}}
 {{- $ingressPath := .Values.ingress.path -}}
-apiVersion: extensions/v1beta1
+apiVersion: {{ template "elasticsearch.ingress.apiVersion" . }}
 kind: Ingress
 metadata:
   name: {{ $fullName }}

elasticsearch/templates/statefulset.yaml

@@ -1,5 +1,5 @@
 ---
-apiVersion: apps/v1beta1
+apiVersion: {{ template "elasticsearch.statefulset.apiVersion" . }}
 kind: StatefulSet
 metadata:
   name: {{ template "uname" . }}