mongodb: fix systemd service

mongodb/tasks/main_buster.yml

@@ -7,7 +7,7 @@
 
 - name: enable APT sources list
   apt_repository:
-    repo: deb http://repo.mongodb.org/apt/debian stretch/mongodb-org/4.2 main
+    repo: deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main
     state: present
     filename: mongodb-org-4.2
     update_cache: yes
@@ -17,6 +17,14 @@
     name: mongodb-org
     update_cache: yes
     state: present
+  register: _mongodb_install_package
+
+- name: MongoDB service in enabled and started
+  systemd:
+    name: mongod
+    enabled: yes
+    state: started
+  when: _mongodb_install_package.changed
 
 - name: install dependency for monitoring
   apt:
@@ -25,7 +33,7 @@
 
 - name: Custom configuration
   template:
-    src: mongod_buster.conf.j2
+    src: mongodb_buster.conf.j2
     dest: "/etc/mongod.conf"
     force: "{{ mongodb_force_config | bool | ternary('yes', 'no') }}"
   notify: restart mongod