elasticsearch/logstash — pull request #1457 by tanob (2014-06-20 02:28:26+00:00)
Title: Fixing expansion of ELASTICSEARCH_VERSION variable in Getting Started tutorial

The variables should be replaced before the markdown conversion, otherwise the "_" character will be escaped and the sed pattern won't replace it.

You can see the problem by going here:
http://logstash.net/docs/1.4.1/tutorials/getting-started-with-logstash

and looking by "ELASTICSEARCH_VERSION".