diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 999cefdaa..8d4a1a524 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -46,7 +46,7 @@ class Attachment < ActiveRecord::Base
   settings index: { number_of_shards: 5 } do
     mappings dynamic: 'false' do
       indexes :filename, analyzer: 'smartcn',index_options: 'offsets'
-      indexes :downloads, analyzer: 'smartcn',index_options: 'offsets'
+      indexes :downloads, index:"not_analyzed",index_options: 'offsets'
     end
   end
 
diff --git a/app/models/course.rb b/app/models/course.rb
index 30a6bb439..8647b82df 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -16,7 +16,7 @@ class Course < ActiveRecord::Base
     mappings dynamic: 'false' do
       indexes :name, analyzer: 'smartcn',index_options: 'offsets'
       indexes :description, analyzer: 'smartcn',index_options: 'offsets'
-      indexes :updated_at, analyzer: 'smartcn',index_options: 'offsets',type:"date"
+      indexes :updated_at, index:"not_analyzed",type:"date"
     end
   end
   
diff --git a/app/models/memo.rb b/app/models/memo.rb
index 5d590e228..2ead1cbb6 100644
--- a/app/models/memo.rb
+++ b/app/models/memo.rb
@@ -22,7 +22,7 @@ class Memo < ActiveRecord::Base
     mappings dynamic: 'false' do
       indexes :subject, analyzer: 'smartcn',index_options: 'offsets'
       indexes :content, analyzer: 'smartcn',index_options: 'offsets'
-      indexes :updated_at, type:'date'
+      indexes :updated_at,index:"not_analyzed" ,type:'date'
     end
   end
 
diff --git a/app/models/project.rb b/app/models/project.rb
index ff546e098..6495dbe26 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -39,7 +39,7 @@ class Project < ActiveRecord::Base
     mappings dynamic: 'false' do
       indexes :name, analyzer: 'smartcn',index_options: 'offsets'
       indexes :description, analyzer: 'smartcn',index_options: 'offsets'
-      indexes :updated_on, analyzer: 'smartcn',index_options: 'offsets', type:'date'
+      indexes :updated_on, index:"not_analyzed", type:'date'
     end
   end
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 9c437a186..17b66a43d 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -35,7 +35,7 @@ class User < Principal
       indexes :login, analyzer: 'smartcn',index_options: 'offsets'
       indexes :firstname, analyzer: 'smartcn',index_options: 'offsets'
       indexes :lastname, analyzer: 'smartcn',index_options: 'offsets'
-      indexes :last_login_on, analyzer: 'smartcn',index_options: 'offsets',type: 'date'
+      indexes :last_login_on,  index:"not_analyzed",type: 'date'
     end
   end