Elsticsearch 自动补全以及基于上下文的提示

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本文链接： https://blog.csdn.net/qq_40990836/article/details/102717281

DELETE articles
PUT articles
{
  "mappings": {
    "properties": {
      "title_completion":{
        "type": "completion"
      }
    }
  }
}

POST articles/_bulk
{ "index" : { } }
{ "title_completion": "lucene is very cool"}
{ "index" : { } }
{ "title_completion": "Elasticsearch builds on top of lucene"}
{ "index" : { } }
{ "title_completion": "Elasticsearch rocks"}
{ "index" : { } }
{ "title_completion": "elastic is the company behind ELK stack"}
{ "index" : { } }
{ "title_completion": "Elk stack rocks"}
{ "index" : {} }


POST articles/_search?pretty
{
  "size": 0,
  "suggest": {
    "article-suggester": {
      "prefix": "elk",
      "completion": {
        "field": "title_completion"
      }
    }
  }
}

重点在于将这个字段的type指定为 completion

"properties": {
   "title_completion":{
     "type": "completion"
   }
}	

如何基于上下文的提示

PUT comments 
{
  "mappings": {
    "properties": {
      "comment_autocomplete":{
        "type": "completion",
        "contexts":[
          {
            "type":"category",
            "name":"comment_category"
          }
        ]
      }
    }
  }
}

将字段comment_autocomplete的type 指定为completion,并且添加contexts,type 为 category, 取名为comment_category

添加数据

POST comments/_doc
{
  "comment":"I love the star war movies",
  "comment_autocomplete":{
    "input":["star wars"],
    "contexts":{
      "comment_category":"movies"
    }
  }
}

POST comments/_doc
{
  "comment":"Where can I find a Starbucks",
  "comment_autocomplete":{
    "input":["starbucks"],
    "contexts":{
      "comment_category":"coffee"
    }
  }
}

查看mapping

{
  "comments" : {
    "mappings" : {
      "properties" : {
        "comment_autocomplete" : {
          "type" : "completion",
          "analyzer" : "simple",
          "preserve_separators" : true,
          "preserve_position_increments" : true,
          "max_input_length" : 50,
          "contexts" : [
            {
              "name" : "comment_category",
              "type" : "CATEGORY"
            }
          ]
        }
      }
    }
  }
}

搜索

POST comments/_search
{
  "suggest": {
    "my_suggestion": {
      "prefix": "star",
      "completion": {
        "field": "comment_autocomplete",
        "contexts":{
          "comment_category":"movies"
        }
      }
    }
  }
}

通过comment_category 感知到用户当前在电影频道

只可以用于前缀索引