add elasticsearch chart

charts/elasticsearch/Chart.yaml

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+apiVersion: v2
+name: elasticsearch
+description: A Helm chart for Elasticsearch
+type: application
+version: 0.1.0
+appVersion: "1.0.0"

charts/elasticsearch/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  selector:
+    app: {{ .Release.Name }}
+  ports:
+  - port: {{ .Values.port }}
+    targetPort: {{ .Values.port }}
+    name: http
+  - port: 9300
+    targetPort: 9300
+    name: transport
+  clusterIP: None

charts/elasticsearch/templates/statefulset.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  serviceName: {{ .Release.Name }}
+  replicas: {{ .Values.replicas }}
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Release.Name }}
+    spec:
+      containers:
+      - name: {{ .Release.Name }}
+        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+        ports:
+          - containerPort: {{ .Values.port }}
+          - containerPort: 9300
+        env:
+        - name: discovery.type
+          value: "single-node"
+        - name: ES_JAVA_OPTS
+          value: {{ .Values.javaOpts }}
+        resources:
+          requests:
+            memory: "{{ .Values.resources.requests.memory }}"
+            cpu: "{{ .Values.resources.requests.cpu }}"
+          limits:
+            memory: "{{ .Values.resources.limits.memory }}"
+            cpu: "{{ .Values.resources.limits.cpu }}"
+        volumeMounts:
+        - name: elasticsearch-data
+          mountPath: /usr/share/elasticsearch/data
+  volumeClaimTemplates:
+  - metadata:
+      name: elasticsearch-data
+    spec:
+      accessModes:
+        - "ReadWriteOnce"
+      storageClassName: "csi-rbd-sc"
+      resources:
+        requests:
+          storage: {{ .Values.storage.size }}

charts/elasticsearch/values.yaml

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+image:
+  repository: docker-registry.wikimedia.org/releng/cirrus-elasticsearch
+  tag: 7.10.2-s0
+replicas: 1
+storage:
+  size: 5Gi
+resources:
+  requests:
+    memory: "512Mi"
+    cpu: "200m"
+  limits:
+    memory: "1Gi"
+    cpu: "500m"
+javaOpts: "-Xms512m -Xmx512m"
+port: 9200