AHOC feat (installation): let indexer run

making indexer run optional and allowing user to control it, cause on big and
mature installations indexer might take substantial time to run and that might
seriously increase deployment time and also cause some other issues, like
sudden high server load and eventual degradation of service for users.

defaults/main.yml

@@ -297,3 +297,8 @@ magento_queue_consumers_cron_template: "/usr/bin/php {{ magento_app_root }}/bin/
 magento_cleanup_old_clones: True
 magento_clones_to_keep: 5
 magento_clones_cleanup_min_age: "1d"
+
+## Enforces indexer run on every deploy
+## by default indexer will run only in case database was created from scratch.
+## In case you need to refresh indexes on deploy (e.g. to fill search index) - set this to true.
+magento_force_reindex_on_deploy: False

tasks/installation.yml

@@ -215,6 +215,7 @@
   become: "yes"
   become_user: "{{ magento_user }}"
   command: "/usr/bin/php {{ magento_app_root }}/bin/magento indexer:reindex"
+  when: magento_db_status.stdout_lines|length == 0 or magento_force_reindex_on_deploy == True
 
 - name: "Disable maintenance mode"
   file: