搜索补全功能使用的是es的completion suggester实现 官方文档地址：

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：