Work around DESI issue #25

`desi install` fails loudly when the current version is already
installed. This patches works around that but the downside is that we
need to explicitely specify the ElasticSearch version we want.

https://github.com/AF83/desi/issues/25
Automatically start ElasticSearch
Initialize ElasticSearch indexes.

Using the new command line from the linuxfr.org README.md