Add Elastic version to software install

[jokvedaras]

Previous logic did not allow for user to install a specific version of elastic. Updated per #497

[dcode]

I'm not sure I see how this logic is any different. The default suffix is "x", which means "7.x" will be installed. If you wanted to stay on 7.4, you would change the suffix to "4.x", which would then set the Elastic version to "7.4.x". I guess line 114 does need to change as you've indicated to make that work though.

Can you revert the other lines or explain how that doesn't work?

[jokvedaras]

In your current baseline, if you set suffix, elastic_baseurl get updated as you said. From my testing, the only acceptable value for elastic_baseurl is https://artifacts.elastic.co/packages/{{ elastic.major_version }}.x/yum. Updating to 7.4 or similar is not a valid URL.

The only reason why you would be interested in this pull request is if you want to have more control over the elastic versions you are installing. I have to use an approved version of elastic hence I had to add this logic in my fork.