chore: Update Compose file version to 3.7

Allows enabling the 'init' option in the 'setup' service.

Requires Docker 18.06.0 and Compose 1.22.0.

README.md

@@ -75,8 +75,8 @@ own_. [sherifabdlnaby/elastdocker][elastdocker] is one example among others of p
 
 ### Host setup
 
-* [Docker Engine](https://docs.docker.com/install/) version **17.05** or newer
+* [Docker Engine](https://docs.docker.com/install/) version **18.06.0** or newer
-* [Docker Compose](https://docs.docker.com/compose/install/) version **1.20.0** or newer
+* [Docker Compose](https://docs.docker.com/compose/install/) version **1.22.0** or newer
 * 1.5 GB of RAM
 
 *:information_source: Especially on Linux, make sure your user has the [required permissions][linux-postinstall] to

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
 
@@ -14,6 +14,7 @@ services:
       context: setup/
       args:
         ELASTIC_VERSION: ${ELASTIC_VERSION}
+    init: true
     volumes:
       - setup:/state:Z
     environment:

extensions/apm-server/apm-server-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   apm-server:

extensions/curator/curator-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   curator:

extensions/enterprise-search/enterprise-search-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   enterprise-search:

extensions/filebeat/filebeat-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   filebeat:

extensions/logspout/logspout-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   logspout:

extensions/metricbeat/metricbeat-compose.yml

@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.7'
 
 services:
   metricbeat: