轮胎未找到部分单词(搜索2个字段)

我想做的事情:

• 我有一个模型“项目”,有两个字段我想弹性搜索:标题和描述。
• 我想在搜索中找到部分单词,例如:bicycle should match to bicycle,bicycle等。。。

现状:

• 搜索只显示完全匹配

以下是我现在在Item模型中的内容:

 include Tire::Model::Search
 include Tire::Model::Callbacks

 class << self
   def search_index
     Tire.index(Item.index_name)
   end
 end

 settings :analysis => {
                    :filter => {
                      :my_ngram  => {
                        "type"     => "nGram",
                        "max_gram" => 10,
                        "min_gram" => 3 }
                    },
                    :analyzer => {
                      :my_analyzer => {
                         "type"         => "custom",
                         "tokenizer"    => "standard",
                         "filter"       => ["my_ngram"]
                       }
                    }
                  } do
   mapping do
     indexes :title,       boost: 10, analyzer: 'my_analyzer'
     indexes :description, boost: 5,  analyzer: 'my_analyzer'
   end
end

 def self.search(query_string)
   tire.search(load: true) do
     if query_string.present?
       query do
         string query_string, default_operator: "AND"
       end
     end
   end
 end