ES: fixes for snippets

app/models/personal_snippet.rb

@@ -19,4 +19,5 @@ class PersonalSnippet < Snippet
   # Elastic search configuration (it does not support STI)
   document_type 'snippet'
   index_name [Rails.application.class.parent_name.downcase, 'snippet', Rails.env].join('-')
+  include Elastic::SnippetsSearch
 end

app/models/project_snippet.rb

@@ -19,6 +19,7 @@ class ProjectSnippet < Snippet
   # Elastic search configuration (it does not support STI)
   document_type 'snippet'
   index_name [Rails.application.class.parent_name.downcase, 'snippet', Rails.env].join('-')
+  include Elastic::SnippetsSearch
 
   belongs_to :project
   belongs_to :author, class_name: "User"