ES search subject with subject member name

app/models/searchable/dependents/user.rb

@@ -17,6 +17,7 @@ module Searchable::Dependents::User
 
       # reindex subject
       created_subjects.each(&:reindex)
+      subjects.each(&:reindex)
     end
   end
 end

app/models/searchable/subject.rb

@@ -27,6 +27,7 @@ module Searchable::Subject
     {
       author_name: user.real_name,
       author_school_name: user.school_name,
+      member_user_names: users.map(&:real_name).join(' ')
     }
   end
 

app/services/concerns/elasticsearch_able.rb

@@ -29,6 +29,7 @@ module ElasticsearchAble
         subject_stages: { type: 'plain' },
         content: { type: 'plain' },
         descendants_contents: { type: 'plain' },
+        member_user_names: { type: 'plain' }
       }
     }
   end