elasticsearch高级功能系列之completion suggest

1、首先创建mapping，注意，在需要建议的field创建一个内部fields，suggest，类型是completion ，因为处理的是中文，所以加了ik中文分词器。

{
 "mappings": {
      "book": {
        "properties": {
          "bookAuthor": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              },
              "suggest": {
                "type": "completion",
                "analyzer": "ik_max_word"
          
              }
            }
        }  
 }

2、添加数据以后，就可以suggest了

GET book/book/_search
{
 "suggest":{
   "mysuggest":{
     "prefix":"三",
     "completion":{
       "field":"bookAuthor.suggest"
     }
   }
 }
}

 3、这是我es中的响应，注意返回的text字段，就是建议器给出的建议，如果要做搜索提示，可以将多个text封装起来返回给前台展示。

{
  "took": 115,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 0,
    "max_score": 0,
    "hits": []
  },
  "suggest": {
    "mysuggest": [
      {
        "text": "三",
        "offset": 0,
        "length": 1,
        "options": [
          {
            "text": "三戒大师",
            "_index": "book",
            "_type": "book",
            "_id": "AWUyRthtLhso7IaOhgG4",
            "_score": 1,
            "_source": {
              "bookAuthor": "三戒大师"
            }
          },
          {
            "text": "三毛",
            "_index": "book",
            "_type": "book",
            "_id": "AWUyRthtLhso7IaOhf9W",
            "_score": 1,
            "_source": {
              "bookAuthor": "三毛"
            }
        ]
      }
    ]
  }
}