Contributor type facet check indexing logic

[ghost]

Current method in DogBiscuits::IndexesCommon:

# Index different contributor types (relators, eg. editor, advisor) into contributor
    # Index the contributor type itself
    def solr_doc_for_contributors(solr_doc)
      if respond_to? :contributors_to_index
        contributors_to_index.each do |v|
          labels = object.send(v).to_a
          # If there is anything in the solr_doc, add to it
          if solr_doc["contributor_combined_tesim"]
            solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_combined", :stored_searchable)].push(*labels).uniq!
            solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_combined", :facetable)].push(*labels).uniq!
          else
            solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_combined", :stored_searchable)] = labels
            solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_combined", :facetable)] = labels
          end
          # @todo I don't think the logic is quite right here as there will only ever be one result
          labels.each do |_label|
            if solr_doc['contributor_type_sim']
              solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_type", :facetable)] << v
            else
              solr_doc[ActiveFedora.index_field_mapper.solr_name("contributor_type", :facetable)] = [v]
            end
          end
        end
      end
    end