how did you install Elasticsearch 5.0.0-alpha5? Did you download the file or did you configure a dedicated repository?
I assume you did not setup a dedicated repository (see the reference docs on how to do that) so you need to download the RPM distribution of Elasticsearch 5.0.0-beta1 and update it with
yum update elasticsearch-5.0.0-beta1.prm
and similarly for the other packages (Kibana / Logstash).
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