I apologize for this rant, but here it goes anyway…
Assigning colors in a pie chart, bar chart, etc. on the fly by the order that numeric values are being plotted is just brain-dead stupid. Colors should be based on the category (or group-by query value) and must be consistent for those values across panels in a dashboard, and must also be persistent across dashboard refreshes. Otherwise, the visualizations are damned-near useless.
Kibana has been this way for many years. I am not a paying customer, so maybe I have no leverage for a complaint; however, I would never be a paying customer based on this deficiency alone.
You folks are better than this. Please fix it.