# File lib/knife-solo/resources/patch_cookbooks/chef-solo-search/libraries/vendor/chef/solr_query/lucene_nodes.rb, line 230
    def transform
      op = self.elements[0].transform
      a = self.elements[1].transform
      spc = case op
            when "+", "-"
              ""
            else
              " "
            end
      "#{op}#{spc}#{a}"
    end