Fix: Role fails on undefined variable

Opis

Nie wiem jakim cudem ale do roli wkradł się bug. W pliku tasks/deploy_service.yml zmienna _elasticsearch_deploy_validation_endpoint jest użyta dwa razy pomimo faktu że w jednym z poprzednich MR została usunięta z roli. Zamiast tej zmiennej powinna być uzyta zmienna _elasticsearch_url.

Logi

TASK [elasticsearch : get cluster settings] **************************************************************************************************************************************************************************************************************************
Monday 07 June 2021  12:51:55 +0000 (0:00:00.174)       0:04:16.889 *********** 
fatal: [elk01.dev.logs.apl.task.gda.pl]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: '_elasticsearch_deploy_validation_endpoint' is undefined\n\nThe error appears to be in '/playbook/roles/elasticsearch/tasks/deploy_service.yml': line 115, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  block:\n    - name: \"get cluster settings\"\n      ^ here\n"}