use become: yes when root is needed

tasks/elasticsearch-RedHat.yml

@@ -1,9 +1,11 @@
 ---
 - name: Ensure libselinux-python on CentOS 6.x
+  become: yes
   yum: name=libselinux-python state=present update_cache=yes
   when: ( ansible_distribution == "CentOS" ) and ( ansible_distribution_major_version == "6" )
 
 - name: RedHat - add Elasticsearch repo
+  become: yes
   template: src=elasticsearch.repo dest=/etc/yum.repos.d/elasticsearch-{{ es_major_version }}.repo
   when: es_use_repository
 
@@ -12,6 +14,7 @@
   when: es_version_lock
 
 - name: RedHat - Install Elasticsearch
+  become: yes
   yum: name=elasticsearch{% if es_version is defined and es_version != ""  %}-{{ es_version }}{% endif %} state=present update_cache=yes
   when: es_use_repository
   register: redhat_elasticsearch_install_from_repo
@@ -20,6 +23,7 @@
   delay: 10
 
 - name: RedHat - Install Elasticsearch from url
+  become: yes
   yum: name={% if es_custom_package_url is defined %}{{ es_custom_package_url }}{% else %}{{ es_package_url }}-{{ es_version }}.noarch.rpm{% endif %} state=present
   when: not es_use_repository
   register: elasticsearch_install_from_package