create ES index every day

ansible/roles/monitoring/elasticsearch.yml.j2

@@ -7,7 +7,7 @@ datasources:
     access: proxy
     url: http://maestro.dmz:{{ elasticsearch_port }}
     jsonData:
-      index: 'fluentd.cpu'
+      index: 'fluentd.cpu.*'
       timeField: '@timestamp'
 
   - name: memory
@@ -15,5 +15,5 @@ datasources:
     access: proxy
     url: http://maestro.dmz:{{ elasticsearch_port }}
     jsonData:
-      index: 'fluentd.memory'
+      index: 'fluentd.memory.*'
       timeField: '@timestamp'

ansible/roles/monitoring/fluent.conf.j2

@@ -11,7 +11,12 @@
   host maestro.dmz
   port {{ elasticsearch_port }}
   include_timestamp true
-  index_name fluentd.${tag}
+  index_name fluentd.${tag}.%Y%m%d
+  <buffer tag, time>
+    timekey 1d
+    flush_mode interval
+    flush_interval 1s
+  </buffer>
 </match>
 
 <system>