Automatic upgrade of snap installation to 18.0.4 just happend which is fine.
But brings me back to a problem, I was able to solve in some “pure” installation, but not with a snap installation of nc.
How do I add elasticsearch search capabilities to a nc snap installation?
My search as of today came up empty - again. 
Greetings and stay healthy!
Wolfgang
Same Problem, but I found this - https://github.com/nextcloud/nextcloud-snap/issues/708
Get the sam error php_readline missing;cannot start indexing for fulltextsearch and looks like it ist still not supported in snap.
Well, today I installed a KVM virtual machine. Installed Nextcloud with Ubuntu 18.04 which uses snap. Added Elasticsearch … and everything is fine.
Elastichsearch Full Text Search is included as an automatic installation in the Nextcloud VM, which is a “pure” installation on Ubuntu Server. Just saying. 