Searchkick/ElasticSearch not accepting Rails/Ruby booleans?

Hey everyone! I'm trying to get elastic search to work with a checkbox, but as they return a 0 or 1 as booleans, elastic search doesn't accept these params. Does anyone know how to get elastic search to work with a 0 or 1? At the moment, I've found a solution by converting the data-types of my 'paid' column to strings which are validated to require 'true' or 'false', but that's obviously not ideal.