So, it took me a while to think about but I think I got it. If you translate it to a vertical bar chart it's easier to figure out.
in Vertical bar chart you would have:
count of unique users as the metric on the Y-axis.
a split by Terms on the categories (ease_of_use, durability, etc) on the X-axis
and then a Split Series with another Terms aggregation on the survey value.
this all is based on a document format like this:
and so on for each user and each of the survey category. I know it's not the most logical format at first sight, but this will make the queries work within Kibana.
If anybody can suggest a better method and a better document format, i'll be curious to see it as well.
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