Hi,
unfortunately kibana doesn't like graphs without aggregation. Million of points are also too much for standard kibana. I am pretty sure you will need vega for this. I also had to plot raw data and vega was a lifesaver. Have a look into vega scatter plots . They should do the trick:
Also: Are those 1Mio points in 1Mio documents? If so you will have to change kibana settings because kibana fetches 10.000 Documents at max.
Maybe my raw data vega script helps you. Have a look.
Good luck.