Is it possible to control the colors of the bars in Kibana?

Something which I would have thought is trivial - so apologies in advance.

I'm collecting data in elastic search. the mapping looks like this:

"mappings" : {
"dosing": {
"properties" : {
"sitename" : {"type" : "string", "index" : "not_analyzed"},
"subjectlabel" : {"type" : "string", "index" : "not_analyzed"},
"visitnumber" : {"type" : "integer"},
"metric" : {"type" : "string"},
"what" : {"type" : "string"},
"risk" : {"type" : "string"},
}}}
Risk is a string with a low, mid or high value - using an Items panel - I
produce a chart with 3 bars - for High, Mid and Low

I have not been able to figure out how to change the colors of the bars -
I'm using the default green, yellow and blue - which doesn't really work
for high, mid and low risk.

I suppose I could hack the CSS and replace the colors with a different
palette but it would be more elegant if there a bar.color property one
could set
Ideas?
Thanks
Danny

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