[API] Generator: Set the right version for the generated API code docs url

Author: picandocodigo

elasticsearch-api/utils/thor/generator/files_helper.rb

@@ -3,6 +3,7 @@
 # See the LICENSE file in the project root for more information
 
 require 'pathname'
+require_relative '../../../lib/elasticsearch/api/version.rb'
 
 module Elasticsearch
   module API
@@ -36,6 +37,11 @@ def self.files(api)
             File.extname(f) != '.json'
         end
       end
+
+      def self.gem_version
+        regex = /([0-9]{1,2}\.[0-9x]{1,2})/
+        Elasticsearch::API::VERSION.match(regex)[0]
+      end
     end
   end
 end

elasticsearch-api/utils/thor/templates/_documentation_top.erb

@@ -24,5 +24,5 @@
 <% end -%>
 <%= '  '*(@namespace_depth+3) -%>#
 <%# Documentation link -%>
-<%=  '  '*(@namespace_depth+3) %># @see <%= @spec['documentation']['url'] ? @spec['documentation']['url'] : "[TODO]" %>
+<%=  '  '*(@namespace_depth+3) %># @see <%= @spec['documentation']['url'] ? @spec['documentation']['url'].gsub(/\/current|master\//, "#{Elasticsearch::API::FilesHelper.gem_version}/") : "[TODO]" %>
 <%= '  '*(@namespace_depth+3) %>#