老师，有报错信息如下：
{
  "error": {
    "root_cause": [
      {
        "type": "parsing_exception",
        "reason": "Unknown key for a START_OBJECT in [multi_match].",
        "line": 2,
        "col": 20
      }
    ],
    "type": "parsing_exception",
    "reason": "Unknown key for a START_OBJECT in [multi_match].",
    "line": 2,
    "col": 20
  },
  "status": 400
}
为什么ES在执行单字符多字段时，会产生multi_match原因呀

老师，为什么下面的不可以搜索出结果？
GET /articles/_search
{
  "suggest": {
    "term-suggestion": {
      "text": "rocks",
      "term": {
        "suggest_mode": "always",
        "field": "body"
      }
    }
  }
}
而下面的又可以搜索出结果？
GET /articles/_search
{
  "suggest": {
    "term-suggestion": {
      "text": "rock",
      "term": {
        "suggest_mode": "always",
        "field": "body"
      }
    }
  }
}
还有，confidence和prefix_length具体是如何控制结果返回的？

官网看到这两段话 可能就是这个原因 穷用的是match_phrase_prefix

Note that the postings highlighter is meant to perform simple query terms highlighting, regardless of their positions. That means that when used for instance in combination with a phrase query, it will highlight all the terms that the query is composed of, regardless of whether they are actually part of a query match, effectively ignoring their positions.


The postings highlighter doesn’t support highlighting some complex queries, like a match query with type set to match_phrase_prefix. No highlighted snippets will be returned in that case.

以上是我的索引 及mapping 提供一些数据给老师您看看
我搜索‘’中国北‘’ 高亮部分会把 “京市”两个字做了高亮处理
如果mapping 不设置分词器的话返回高亮部分是对的

"highlight" : {
          "address" : [
            "</em>中国<em></em>北京市<em>朝阳区建国门"
          ]
        },

POST _bulk
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"双榆树-张三","massage":"今天天气不错啊，出去转转去","uid":2,"age":20,"city":"北京","province":"北京","country":"中国","address":"中国北京市海淀区","location":{"lat":39.970718,"lon":116.325747}}
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"老城区-老刘","massage":"出发，下一站云南","uid":3,"age":30,"city":"北京","province":"北京","country":"中国","address":"中国北京市老城区台基厂33号","location":{"lat":39.904313,"lon":116.412754}}
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"东城区-李四","massage":"happy birthday!","uid":4,"age":30,"city":"北京","province":"北京","country":"中国","address":"中国北京市东城区","location":{"lat":39.893801,"lon":116.408986}}
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"朝阳区-老贾","massage":"你有没有在在想我","uid":5,"age":35,"city":"北京","province":"北京","country":"中国","address":"中国北京市朝阳区建国门","location":{"lat":39.718256,"lon":116.367910}}
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"朝阳区-老王","massage":"祝你生日快乐 Miss you","uid":6,"age":50,"city":"北京","province":"北京","country":"中国","address":"中国北京市朝阳区国贸","location":{"lat":39.918256,"lon":116.467910}}
{"index":{"_index":"twitter", "_type" : "_doc"}}
{"user":"虹桥-老吴","massage":"什么狗屁生日 我就没有过过","uid":7,"age":99,"city":"上海","province":"上海","country":"中国","address":"中国上海市闵行区","location":{"lat":31.175927,"lon":121.383328}}

GET twitter/_search
{ "query": {"multi_match": {"type": "phrase_prefix", "query": "中国北","analyzer": "ik_smart"}},"highlight": {"post_tags": ["<em>"],"pre_tags": ["</em>"],"fields": {"address": {}}
  },"sort": [{"age": {"order": "desc"}}]}

PUT twitter
{"settings": {"number_of_shards": 1} }

PUT twitter/_mapping/_doc
{ "properties" : { "address" : {"type" : "text","analyzer":"ik_smart","fields" : {"keyword" : {"type" : "keyword","ignore_above" : 256 } } },"age" : {"type" : "long"},"city" : {"type" : "text","fields" : { "keyword" : {"type" : "keyword","ignore_above" : 256} }},"country" : {"type" : "text","fields" : {"keyword" : {"type" : "keyword","ignore_above" : 256} }},"location" : { "type":"geo_point" },"massage" : {"type" : "text","fields" : {"keyword" : {"type" : "keyword","ignore_above" : 256}}},"province" : {"type" : "text","fields" : {"keyword" : {"type" : "keyword","ignore_above" : 256}}},"uid" : {"type" : "long"},"user" : {
"type" : "text","fields" : {"keyword" : {"type" : "keyword","ignore_above" : 256} }}}}