class ActiveFedora::NomDatastream

def to_solr
  solr_doc = {}
  ng_xml.terminology.flatten.select { |x| x.options[:index] }.each do |term|
    term.values.each do |v|
      Array(term.options[:index]).each do |index_as|
        solr_doc[index_as] ||= []
        if v.is_a? Nokogiri::XML::Node
          solr_doc[index_as] << v.text
        else
          solr_doc[index_as] << v
        end
      end
    end
  end
  solr_doc
end