Allowing python3 to respond to python

Author: Red-GV

elasticsearch/Dockerfile.origin

@@ -35,6 +35,7 @@ RUN  yum install -y --nogpgcheck \
               unzip" && \
      yum install -y ${packages} && \
      rpm -V ${packages} && \
+     alternatives --set python /usr/bin/python3 && \
      yum clean all
 
 ADD extra-jvm.options ci-env.sh install-es.sh /var/tmp