Typo in elasticsearch installation instructions

[darkmsph1t]

Hello, The instructions for elasticsearch installation contains a typo which will cause installation to fail: Instead of /etc/yum/repos.d/elasticsearch.repo it should be /etc/yum.repos.d/elasticsearch.repo. When making this change, the package is able to be installed without issue

[ayedaemon]

This got me too. Seems like it is a typo error. I have created a PR #196 for the same.