Fix task condition (#373)

Co-authored-by: Saeid Hassan-Abadi <[email protected]>

Author: Saeid-Abadi

Diff for: roles/elasticstack/tasks/packages.yml

@@ -56,7 +56,7 @@
           - python3-elasticsearch
           - python3-cryptography
       when:
-        - elasticstack_pip_installation
+        - not elasticstack_pip_installation | bool
 
 - name: Install Python Modules via pip  - forced
   ansible.builtin.pip: