Devenv: fix kibana in elastic7 docker block (grafana#20308)

* Devenv: fix kibana in elastic7 docker block

* Remove network host mode for metricbeat container

Author: davkal

devenv/docker/blocks/elastic7/docker-compose.yaml

@@ -26,7 +26,6 @@
 
   metricbeat7:
     image: docker.elastic.co/beats/metricbeat-oss:7.0.0
-    network_mode: host
     command: metricbeat -e -strict.perms=false
     user: root
     volumes:
@@ -37,5 +36,7 @@
     image: docker.elastic.co/kibana/kibana-oss:7.0.0
     ports:
       - "5601:5601"
+    links:
+      - elasticsearch7
     environment:
       ELASTICSEARCH_HOSTS: http://elasticsearch7:9200

devenv/docker/blocks/elastic7/metricbeat.yml

@@ -28,11 +28,11 @@ processors:
   - add_cloud_metadata: ~
 
 output.elasticsearch:
-  hosts: ["localhost:12200"]
+  hosts: ["elasticsearch7:9200"]
   index: "metricbeat-%{+yyyy.MM.dd}"
 
 setup.template.name: "metricbeat"
 setup.template.pattern: "metricbeat-*"
 setup.template.settings:
   index.number_of_shards: 1
-  index.number_of_replicas: 1
+  index.number_of_replicas: 1