Implemented vars, tasks and templates for central database setup until mastodon role

roles/docker-elk/templates/docker-compose.yml.j2

@@ -23,8 +23,6 @@ services:
       # Use single node discovery in order to disable production mode and avoid bootstrap checks.
       # see: https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html
       discovery.type: single-node
-    networks:
-      - elk
 
   logstash:
     build:
@@ -47,8 +45,6 @@ services:
       - "9600:9600"
     environment:
       LS_JAVA_OPTS: "-Xmx256m -Xms256m"
-    networks:
-      - elk
     depends_on:
       - elasticsearch
 
@@ -64,14 +60,8 @@ services:
         read_only: true
     ports:
       - "127.0.0.1:{{ http_port }}:5601"
-    networks:
-      - elk
     depends_on:
       - elasticsearch
 
-networks:
-  elk:
-    driver: bridge
-
 volumes:
   elasticsearch: