[MODEL] Allow acessing result._source.foo as result.foo directly

Author: karmi

elasticsearch-model/lib/elasticsearch/model/response/result.rb

@@ -10,13 +10,22 @@ def initialize(attributes)
         # Delegate methods to `@result`
         #
         def method_missing(method_name, *arguments)
-          @result.respond_to?(method_name.to_sym) ? @result[method_name.to_sym] : super
+          case
+          when @result.respond_to?(method_name.to_sym)
+            @result[method_name.to_sym]
+          when @result._source && @result._source.respond_to?(method_name.to_sym)
+            @result._source[method_name.to_sym]
+          else
+            super
+          end
         end
 
         # Respond to methods from `@result`
         #
         def respond_to?(method_name, include_private = false)
-          @result.has_key?(method_name.to_sym) || super
+          @result.has_key?(method_name.to_sym) || \
+          @result._source && @result._source.has_key?(method_name.to_sym) || \
+          super
         end
 
         # TODO: #to_s, #inspect, with support for Pry