can any one suggest me, is their any module in ansible to pull latest war file from Jfrog artifactory
You should probably take a look at the maven_artifact module. Since your using artifactory I'm assuming your war file was deployed as a maven artifact. If not you can also use get_url and provide the URL to your artifact with the [RELEASE] variable in place of the version number.
Maven module
http://docs.ansible.com/ansible/latest/maven_artifact_module.html