Elasticsearch学习笔记5: suggest实现搜索补全

搜索补全功能使用的是es的completion suggester实现 官方文档地址：https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html

先设置mapping：

POST  /index/completion/_mapping
{
  "properties":{
    "title": {
      "type": "text",
      "analyzer": "ik_sync_smart"
    },
    "title_suggest": {
      "type": "completion",
      "analyzer": "ik_sync_smart",
      "search_analyzer": "ik_sync_smart"
    }
  }
}

重点是title_suggest,这个字段就是之后我们搜索补全的字段，需要设置type为completion，analyzer按情况设置分析器

索引数据：

POST /index/completion/_bulk
{ "index" : { } }
{ "title": "背景天安门广场大学", "title_suggest": "背景天安门广场大学"}
{ "index" : { } }
{ "title": "北京天安门","title_suggest": "北京天安门"}
{ "index" : { } }
{ "title": "北京鸟巢","title_suggest": "北京鸟巢"}
{ "index" : { } }
{ "title": "奥林匹克公园","title_suggest": "奥林匹克公园"}
{ "index" : { } }
{ "title": "奥林匹克森林公园","title_suggest": "奥林匹克森林公园"}
{ "index" : { } }
{ "title": "北京奥林匹克公园","title_suggest": "北京奥林匹克公园"}
{ "index" : { } }
{ "title": "北京奥林匹克公园","title_suggest": {"input": "我爱中国","weight": 100}}

索引的时候可以对suggest字段，增加weight增加排序权重

搜索补全：

POST /index/completion/_search
{ "size": 0,
  "suggest": {
    "blog-suggest": {
      "prefix": "北京",
      "completion": {
        "field": "title_suggest"
      }
    }
  }
}
返回：
{
    "took": 27,
    "timed_out": false,
    "_shards": {
        "total": 3,
        "successful": 3,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": 0,
        "max_score": 0,
        "hits": []
    },
    "suggest": {
        "blog-suggest": [
            {
                "text": "北京",
                "offset": 0,
                "length": 2,
                "options": [
                    {
                        "text": "北京天安门",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I6",
                        "_score": 1,
                        "_source": {
                            "title": "北京天安门",
                            "title_suggest": "北京天安门"
                        }
                    },
                    {
                        "text": "北京奥林匹克公园",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I-",
                        "_score": 1,
                        "_source": {
                            "title": "北京奥林匹克公园",
                            "title_suggest": "北京奥林匹克公园"
                        }
                    },
                    {
                        "text": "北京鸟巢",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I7",
                        "_score": 1,
                        "_source": {
                            "title": "北京鸟巢",
                            "title_suggest": "北京鸟巢"
                        }
                    }
                ]
            }
        ]
    }
}

参考链接： https://elasticsearch.cn/article/142 https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html