Vega chart has to display "No data to display" string when it has no data for the field flow.bytes over flow.src_hostname and flow.dst_hostname.
But it display the a string "Infinite extent for field "y1": [Infinity, -Infinity]"
ELK version 7.10.2
Vega chart version: shema- https://vega.github.io/schema/vega/v3.0.json