If I had a section of my JSON input into ElasticSearch that looks like below, and I am able to access categories.category.keyword and categories.totaldur is it possible to create a visualization with the different categories and their totaldur?
That's currently not possible because it would require nested fields that are not supported yet by Kibana. You can denormalize your data and expand each document into n documents with each document just containing a single category, then you can use the regular visualization capabilities of Kibana.
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