elasticsearch 搜索的时候怎么设置对搜索词不进行分词

用了_analyze 接口，发现查询潮流的时候会这样

{
  "tokens": [
    {
      "token": "潮",
      "start_offset": 0,
      "end_offset": 1,
      "type": "<IDEOGRAPHIC>",
      "position": 0
    },
    {
      "token": "流",
      "start_offset": 1,
      "end_offset": 2,
      "type": "<IDEOGRAPHIC>",
      "position": 1
    }
  ]
}

但是我不希望他对搜索词进行分词

mapping 是这样的

mappings: {
                   product: {
                     properties: {
                       title:      { type: 'text', boost: 100, index: 'not_analyzed' }, # analyzer: 'ik_smart', index: 'not_analyzed'
                       summary:    { type: 'text', boost: 10, index: 'not_analyzed' }, # analyzer: 'ik_smart', index: 'not_analyzed' },
                       content:    { type: 'text', boost: 10, index: 'not_analyzed' }, # analyzer: 'ik_smart', index: 'not_analyzed' },
                       class_name: { type: 'string', index: "not_analyzed" },
                       tags:       { type: 'text', boost: 100, index: 'not_analyzed' }, # analyzer: 'ik_smart', index: 'not_analyzed' },
                       date:       { type: 'date',  format: "yyyy-MM-dd'T'HH:mm:ss.SSSZZ"}
                     }
                   }
                 }