Add support for Solr 5.x

[mgp-novicell]

It would be really helpful if support for Solr was updated to include version 5

[geerlingguy]

Upstream issue: geerlingguy/ansible-role-solr#10

[geerlingguy]

Did one better and also got Solr 6.x support added!

I will update the role requirements file for 3.0.0 soon, or I might finish adding automatic core provisioning and tag a new release of the upstream role before adding (therefore I'll leave this issue open until that's complete).

The alternative (if I use the current version of the role) is to just have the post-install script example also create a custom core to be used by the Search API Solr module.

[geerlingguy]

3.1.0 includes automatic core setup/generation, as well as memory configuration, so I'll be moving to that version for Drupal VM 3.1.0, and also updating the default version in default.config.yml to the latest 5.x Solr release.

It looks like Solr 6 support is already in 8.x (https://www.drupal.org/node/2704383), but not yet in 7.x (https://www.drupal.org/node/2711685).

Once this is in, you could change solr versions by destroying and rebuilding the VM, switching the solr_version between solr_version: "5.5.1" and solr_version: "6.0.1"—or really any version between 3.5.x and the latest 6.x!