Refactor deprecated filter calls

Previously, each of the calls generated a warning : "Using tests as
filters is deprecated. Instead of using `result|version_compare` use
`result is version_compare`. This feature will be removed in version
2.9.".

tasks/compatibility-variables.yml

@@ -18,7 +18,7 @@
 - name: Detect if es_version is before X-Pack was open and included
   set_fact:
     es_open_xpack: false
-  when: "es_version | version_compare('6.3.0', '<')"
+  when: "es_version is version_compare('6.3.0', '<')"
 
 - name: If this is an older version we need to install X-Pack as a plugin and use a differet users command
   set_fact:

tasks/xpack/elasticsearch-xpack.yml

@@ -20,4 +20,4 @@
 - name: Set elasticsearch.keystore Permissions
   become: yes
   file: state=file path={{ conf_dir }}/elasticsearch.keystore owner={{ es_user }} group={{ es_group }}
-  when: es_enable_xpack and "security" in es_xpack_features and (es_version | version_compare('6.0.0', '>'))
+  when: es_enable_xpack and "security" in es_xpack_features and (es_version is version_compare('6.0.0', '>'))

tasks/xpack/security/elasticsearch-security.yml

@@ -14,7 +14,7 @@
 #-----------------------------Create Bootstrap User-----------------------------------
 ### START BLOCK elasticsearch keystore ###
 - name: create the elasticsearch keystore
-  when: (es_enable_xpack and "security" in es_xpack_features) and (es_version | version_compare('6.0.0', '>'))
+  when: (es_enable_xpack and "security" in es_xpack_features) and (es_version is version_compare('6.0.0', '>'))
   block:
   - name: create the keystore if it doesn't exist yet
     become: yes