ES have debs on their website
http://www.elasticsearch.org/download/2012/12/07/0.20.1.html
<h2 class="download_link">
0.20.1: <a href="https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.20.1.zip">zip</a>
/ <a href="https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.20.1.tar.gz">tar.gz</a>
/ <a href="https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.20.1.deb">deb</a>
/ <a href="https://github.com/elasticsearch/elasticsearch/issues?labels=v0.20.1&sort=created&direction=desc&state=closed&page=1">issues</a>
</h2>http://www.elasticsearch.org/guide/reference/modules/plugins...
"The ability to install plugins from github allows to easily install site plugins hosted there"