Add a volume for elasticsearch. (#122)

analytics/docker-compose.yml

@@ -11,6 +11,8 @@ services:
       context: ./analytics/elasticsearch
       args:
         ELK_VERSION: 6.4.0
+    volumes:
+      - cvat_events:/usr/share/elasticsearch/data
     restart: always
 
   cvat_kibana:
@@ -62,3 +64,6 @@ services:
       DJANGO_LOG_SERVER_HOST: "logstash"
       DJANGO_LOG_SERVER_PORT: 5000
       no_proxy: logstash,${no_proxy}
+
+volumes:
+  cvat_events:

analytics/elasticsearch/elasticsearch.yml

@@ -1,3 +1,3 @@
 http.host: 0.0.0.0
 script.painless.regex.enabled: true
-path.repo: ["/usr/share/elasticsearch/backup"]
+path.repo: ["/usr/share/elasticsearch/data/backup"]