[MODEL] Added automatic handling multi_field properties in indexes blocks

    mappings.indexes :name, type: 'multi_field' do
      indexes :name, analyzer: 'snowball'
      indexes :raw,  analyzer: 'keyword'
    end

Author: karmi

elasticsearch-model/lib/elasticsearch/model/indexing.rb

@@ -46,12 +46,14 @@ def indexes(name, options = {}, &block)
           @mapping[name] = options
 
           if block_given?
-            @mapping[name][:type]       ||= 'object'
-            @mapping[name][:properties] ||= {}
+            @mapping[name][:type] ||= 'object'
+            properties = @mapping[name][:type] == 'multi_field' ? :fields : :properties
+
+            @mapping[name][properties] ||= {}
 
             previous = @mapping
             begin
-              @mapping = @mapping[name][:properties]
+              @mapping = @mapping[name][properties]
               self.instance_eval(&block)
             ensure
               @mapping = previous

elasticsearch-model/test/unit/indexing_test.rb

@@ -75,8 +75,20 @@ def self.foo
           indexes :bar
         end
 
+        mappings.indexes :multi, type: 'multi_field' do
+          indexes :multi, analyzer: 'snowball'
+          indexes :raw,   analyzer: 'keyword'
+        end
+
         assert_equal 'object', mappings.to_hash[:mytype][:properties][:foo][:type]
         assert_equal 'string', mappings.to_hash[:mytype][:properties][:foo][:properties][:bar][:type]
+
+        assert_equal 'multi_field', mappings.to_hash[:mytype][:properties][:multi][:type]
+        assert_equal 'snowball', mappings.to_hash[:mytype][:properties][:multi][:fields][:multi][:analyzer]
+        assert_equal 'keyword',  mappings.to_hash[:mytype][:properties][:multi][:fields][:raw][:analyzer]
+      end
+
+      should "define multi_field properties" do
       end
     end