Creating success rate based on boolean field

Hello,
I'm using elk 7.11.2
I want to do a line chart where I plot a ratio over time of a certain boolean field.
Ie, i want aggregate by time (minutes or hours) and plot the percentage of records where the boolean field is equal to "true" per example

This is the filed i want to plot:
image

And the goals is to do something similar to the image shown below:
ratiosuccess

Thank you in advance,
Frederico

-----EDIT------
I managed to do it, by creating a calculated field and transforming true into 1 and false into 0, and then do a simple line chart where I display the average by hour.
What if I want to show the same but in a field with many possible string values? Basically to show the most common ones in percentage aggregated by time

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