not_analyzed没有按预期工作

Mapping:

include Tire::Model::Search
mapping do
  indexes :name, :boost => 10
  indexes :account_id
  indexes :company_name
  indexes :email, :index => :not_analyzed
end

def to_indexed_json
  to_json( :only => [:name, :account_id, :email, :company_name], 
         )
end
include Tire::Model::Search
mapping