Fix 2 idempotence issues

tasks/elasticsearch-Debian-version-lock.yml

@@ -1,3 +1,5 @@
 ---
 - name: Debian - hold elasticsearch version
   command: apt-mark hold elasticsearch
+  register: hold_elasticsearch_result
+  changed_when: "hold_elasticsearch_result.stdout != 'elasticsearch was already set on hold.'"

tasks/java.yml

@@ -9,14 +9,15 @@
 - name: RedHat - Ensure Java is installed
   yum: name={{ java }} state={{java_state}}
   when: ansible_os_family == 'RedHat'
-  
+
 - name: Debian - Ensure Java is installed
   apt: name={{ java }} state={{java_state}} update_cache=yes force=yes
   when: ansible_os_family == 'Debian'
 
 - command: java -version 2>&1 | grep OpenJDK
   register: open_jdk
+  changed_when: false
 
 - name: refresh the java ca-certificates
   command: /var/lib/dpkg/info/ca-certificates-java.postinst configure
-  when: ansible_distribution == 'Ubuntu' and open_jdk.rc == 0
+  when: ansible_distribution == 'Ubuntu' and open_jdk.rc == 0