Remove elasticsearch_protocol unused variable

'elasticsearch_protocol' is define in group_vars but unused,
it must be removed.

Change-Id: I15cabb9a2d73dd60d06ec2a4fcececa76e14a1db

ansible/group_vars/all.yml

@@ -412,8 +412,6 @@ enable_destroy_images: "no"
 ####################
 
 elasticsearch_address: "{{ kolla_internal_vip_address }}"
-elasticsearch_protocol: "{{ internal_protocol }}"
-
 enable_elasticsearch: "{{ 'yes' if enable_central_logging | bool or enable_freezer | bool or enable_osprofiler | bool or enable_skydive | bool else 'no' }}"
 enable_kibana: "{{ 'yes' if enable_central_logging | bool else 'no' }}"