logging: add elasticsearch

apps/system/logging/requirements.yaml

@@ -5,3 +5,6 @@ dependencies:
 - name: mongodb
   version: '7.4.5'
   repository: '@stable'
+- name: elasticsearch
+  version: '7.4.1'
+  repository: https://helm.elastic.co

apps/system/logging/templates/elasticsearch-volume.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: elasticsearch
+spec:
+  capacity:
+    storage: 30Gi
+  accessModes:
+  - ReadWriteOnce
+  hostPath:
+    path: /data/elasticsearch

apps/system/logging/values.yaml

@@ -10,6 +10,11 @@ mongodb:
   persistence:
     existingClaim: mongodb
 
+elasticsearch:
+  replicas: 1
+  volumeClaimTemplate:
+    volumeName: elasticsearch
+
 graylog:
   nameOverride: graylog
   fullnameOverride: graylog
@@ -28,6 +33,7 @@ graylog:
         - graylog.gorilych.ru
         secretName: graylog-tls
     mongodb:
-      uri:
-        mongodb://mongodb:27017/graylog
+      uri: mongodb://mongodb:27017/graylog
+    elasticsearch:
+      hosts: http://elasticsearch-master:9200