原文链接 https://my.oschina.net/u/2299936/blog/1800139
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/142https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html