This extension currently ships with Elasticsearch integration which is
enabled by default. This behaviour is kept for backwards compatibility.
Still you now have the possibility to disable this integration in
extension manager, just check the "disable" box for elasticsearch.
In the future elasticsearch will become another extension and no default
is shipped with search_core. But for now, as we are still in alpha /
beta phase we keep things together to keep development fast.
Resolves: #111
