Elasticsearch學習筆記5: suggest實現搜索補全

搜索補全功能使用的是es的completion suggester實現 官方文檔地址：https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html

先設置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"
    }
  }
}

重點是title_suggest,這個字段就是以後咱們搜索補全的字段，須要設置type爲completion，analyzer按狀況設置分析器

索引數據：

POST /index/completion/_bulk
{ "index" : { } }
{ "title": "背景天安門廣場大學", "title_suggest": "背景天安門廣場大學"}
{ "index" : { } }
{ "title": "北京天安門","title_suggest": "北京天安門"}
{ "index" : { } }
{ "title": "北京鳥巢","title_suggest": "北京鳥巢"}
{ "index" : { } }
{ "title": "奧林匹克公園","title_suggest": "奧林匹克公園"}
{ "index" : { } }
{ "title": "奧林匹克森林公園","title_suggest": "奧林匹克森林公園"}
{ "index" : { } }
{ "title": "北京奧林匹克公園","title_suggest": "北京奧林匹克公園"}
{ "index" : { } }
{ "title": "北京奧林匹克公園","title_suggest": {"input": "我愛中國","weight": 100}}

索引的時候能夠對suggest字段，增長weight增長排序權重

搜索補全：

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": "北京天安門",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I6",
                        "_score": 1,
                        "_source": {
                            "title": "北京天安門",
                            "title_suggest": "北京天安門"
                        }
                    },
                    {
                        "text": "北京奧林匹克公園",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I-",
                        "_score": 1,
                        "_source": {
                            "title": "北京奧林匹克公園",
                            "title_suggest": "北京奧林匹克公園"
                        }
                    },
                    {
                        "text": "北京鳥巢",
                        "_index": "jzbsearch",
                        "_type": "completion",
                        "_id": "AWK9FJDeGCbNhyb_l9I7",
                        "_score": 1,
                        "_source": {
                            "title": "北京鳥巢",
                            "title_suggest": "北京鳥巢"
                        }
                    }
                ]
            }
        ]
    }
}

參考連接： https://elasticsearch.cn/article/142 https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html