I tried to import a dashboard to kibana 6.1.1 from kibana 6.0.0.
This failed because kibana 6.1.1 had problems recognising keywords. E.g.
6.0.0 uses this type of format for the export file "field":"pilotName.keyword"
I manually edited the export file to use this format "field":"pilotName" ( so removing ".keyword" )
This seems to fix the problem and the dashboard imported successfully and seems to function properly.
I thought I'd report this as it appears to be a bug. It might also help someone else.
Other than that the installation of 6.1.1 is working very nicely thanks.