[cherry-pick] Update documentation for KubeDB v1alpha2 (#616) (#673)

/cherry-pick
Signed-off-by: Emruz Hossain <emruz@appscode.com>

Tasks:
- [x] Update existing documentation
- [x] Add auto-backup documentation
- [x] Add backup/restore customization documentation
- [x] Test docs rendering  locally

Co-authored-by: Emruz Hossain <emruz@appscode.com>

Author: 1gtm

docs/auto-backup/examples/backupblueprint.yaml

@@ -0,0 +1,28 @@
+apiVersion: stash.appscode.com/v1beta1
+kind: BackupBlueprint
+metadata:
+  name: elasticsearch-backup-template
+spec:
+  # ============== Blueprint for Repository ==========================
+  backend:
+    gcs:
+      bucket: stash-testing
+      prefix: stash-backup/${TARGET_NAMESPACE}/${TARGET_APP_RESOURCE}/${TARGET_NAME}
+    storageSecretName: gcs-secret
+  # ============== Blueprint for BackupConfiguration =================
+  task:
+    name: elasticsearch-backup-7.3.2-v6
+  schedule: "*/5 * * * *"
+  interimVolumeTemplate:
+    metadata:
+      name: ${TARGET_APP_RESOURCE}-${TARGET_NAME} # To ensure that the PVC names are unique for different database
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: "standard"
+      resources:
+        requests:
+          storage: 1Gi
+  retentionPolicy:
+    name: 'keep-last-5'
+    keepLast: 5
+    prune: true

docs/auto-backup/examples/es-demo-2.yaml

@@ -0,0 +1,18 @@
+apiVersion: kubedb.com/v1alpha2
+kind: Elasticsearch
+metadata:
+  name: es-demo-2
+  namespace: demo-2
+  annotations:
+    stash.appscode.com/backup-blueprint: elasticsearch-backup-template
+    stash.appscode.com/schedule: "*/3 * * * *"
+spec:
+  version: 7.9.1-xpack
+  replicas: 1
+  storageType: Durable
+  storage:
+    resources:
+      requests:
+        storage: 1Gi
+    storageClassName: standard
+  terminationPolicy: WipeOut

docs/auto-backup/examples/es-demo-3.yaml

@@ -0,0 +1,18 @@
+apiVersion: kubedb.com/v1alpha2
+kind: Elasticsearch
+metadata:
+  name: es-demo-3
+  namespace: demo-3
+  annotations:
+    stash.appscode.com/backup-blueprint: elasticsearch-backup-template
+    params.stash.appscode.com/args: --ignoreType=settings,template
+spec:
+  version: 7.9.1-xpack
+  replicas: 1
+  storageType: Durable
+  storage:
+    resources:
+      requests:
+        storage: 1Gi
+    storageClassName: standard
+  terminationPolicy: WipeOut

docs/auto-backup/examples/es-demo.yaml

@@ -0,0 +1,17 @@
+apiVersion: kubedb.com/v1alpha2
+kind: Elasticsearch
+metadata:
+  name: es-demo
+  namespace: demo
+  annotations:
+    stash.appscode.com/backup-blueprint: elasticsearch-backup-template
+spec:
+  version: 7.9.1-xpack
+  replicas: 1
+  storageType: Durable
+  storage:
+    resources:
+      requests:
+        storage: 1Gi
+    storageClassName: standard
+  terminationPolicy: WipeOut