One project worth keeping an eye on is Loki (https://github.com/grafana/loki), which eschews full text search for more basic indexing off of "labels", ie it works a lot like prometheus.

There's a writeup on the differences with the EFK stack here: https://github.com/grafana/loki/blob/master/docs/overview/co...

After working with a client for multiple years continually hitting bottlenecks and complexity with the EFK stack, I'm really looking forward to something different.