76_elasticsearch高手进阶_基于completio

76_elasticsearch高手进阶_基于completion suggest实现搜索提示

suggest，completion suggest，自动完成，搜索推荐，搜索提示 --> 自动完成，auto completion

auto completion

比如说我们在百度，搜索，你现在搜索“大话西游” -->
百度，自动给你提示，“大话西游电影”，“大话西游小说”， “大话西游手游”

不用你把所有你想要输入的文本都输入完，搜索引擎会自动提示你可能是你想要搜索的那个文本

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"
        }
      }
    }
  }
}

completion，es实现的时候，是非常高性能的，会构建不是倒排索引，也不是正拍索引，就是纯的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，性能是非常高的

大话西游(添加数据)

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"
}

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

搜索结果如下;

{
"took": 6,
"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"
}
}
]
}
]
}
}

接下来我们就可以根据上一步的搜索推荐词来进行下一步的搜素了

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

搜索结果:
{
"took": 9,
"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"
}
}
]
}
}