Add id searchable

app/models/cdao/subject.rb

@@ -49,6 +49,7 @@ class Cdao::Subject < Cdao::Base
   end
 
   searchable do
+    integer :id
     integer :parent_id
     integer :doctrine_ids, multiple: true
 

app/models/doctrine.rb

@@ -46,6 +46,7 @@ class Doctrine < ApplicationRecord
   searchable do 
     text :content
 
+    integer :id
     integer :document_id
 
     integer :subject_ids, multiple: true