Elasticsearch-95-基于completion suggest实现搜索提示

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completion suggest

搜索联想,智能提示,自动完成(auto completion)
比如说,google搜索 Elastic,会自动提示elasticsearch, 等等

案例

创建索引

首先,需要创建索引的时候,设置completion

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PUT /news_website
{
  "mappings": {
    "news" : {
      "properties" : {
        "title" : {
          "type": "text",
          "analyzer": "ik_max_word",
          "fields": {
            "suggest" : {
              "type" : "completion",
              "analyzer": "ik_max_word"
            }
          }
        },
        "content": {
          "type": "text",
          "analyzer": "ik_max_word"
        }
      }
    }
  }
}

title里面,内置了一个field, suggest type设置为completion

completion:es实现的时候是非常高性能的,不是用倒排索引,也不是用正排索引,就是纯用于进行前缀搜索的一种特殊的数据结构,而且会全部放在内存中,所以auto completion进行的前缀搜索提示,性能是很高的

添加测试数据
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PUT /news_website/news/1
{
  "title": "大话西游电影",
  "content": "大话西游的电影时隔20年即将在2017年4月重映"
}
PUT /news_website/news/2
{
  "title": "大话西游小说",
  "content": "某知名网络小说作家已经完成了大话西游同名小说的出版"
}
PUT /news_website/news/3
{
  "title": "大话西游手游",
  "content": "网易游戏近日出品了大话西游经典IP的手游，正在火爆内测中"
}
搜索

请求

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GET /news_website/news/_search
{
  "suggest":{
    "my-suggest":{
      "prefix":"大话西游",
      "completion":{
        "field":"title.suggest"
      }
    }
  }
}

返回值:

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{
  "took": 13,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 0,
    "max_score": 0,
    "hits": []
  },
  "suggest": {
    "my-suggest": [
      {
        "text": "大话西游",
        "offset": 0,
        "length": 4,
        "options": [
          {
            "text": "大话西游小说",
            "_index": "news_website",
            "_type": "news",
            "_id": "2",
            "_score": 1,
            "_source": {
              "title": "大话西游小说",
              "content": "某知名网络小说作家已经完成了大话西游同名小说的出版"
            }
          },
          {
            "text": "大话西游手游",
            "_index": "news_website",
            "_type": "news",
            "_id": "3",
            "_score": 1,
            "_source": {
              "title": "大话西游手游",
              "content": "网易游戏近日出品了大话西游经典IP的手游，正在火爆内测中"
            }
          },
          {
            "text": "大话西游电影",
            "_index": "news_website",
            "_type": "news",
            "_id": "1",
            "_score": 1,
            "_source": {
              "title": "大话西游电影",
              "content": "大话西游的电影时隔20年即将在2017年4月重映"
            }
          }
        ]
      }
    ]
  }
}

这样所有大话西游前缀的数据都出来了, 然后我们比如要搜大话西游电影,那么请求就是

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GET /news_website/news/_search
{
  "query": {
    "match": {
      "content": "大话西游电影"
    }
  }
}

返回值:

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{
  "took": 4,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": 1.3495269,
    "hits": [
      {
        "_index": "news_website",
        "_type": "news",
        "_id": "1",
        "_score": 1.3495269,
        "_source": {
          "title": "大话西游电影",
          "content": "大话西游的电影时隔20年即将在2017年4月重映"
        }
      },
      {
        "_index": "news_website",
        "_type": "news",
        "_id": "3",
        "_score": 1.217097,
        "_source": {
          "title": "大话西游手游",
          "content": "网易游戏近日出品了大话西游经典IP的手游，正在火爆内测中"
        }
      },
      {
        "_index": "news_website",
        "_type": "news",
        "_id": "2",
        "_score": 1.1299736,
        "_source": {
          "title": "大话西游小说",
          "content": "某知名网络小说作家已经完成了大话西游同名小说的出版"
        }
      }
    ]
  }
}

大话西游电影就被排在了最前面