ElasticSearch 无法从同一文档获取多个建议值

Question

你能帮我吗？

我在 ElasticSearch 中的 Completion Suggester 方面遇到问题

示例：我有此映射：

PUT music
{
  "mappings": {
    "properties": {
      "suggest": {
        "type": "completion"
      },
      "title": {
        "type": "keyword"
      }
    }
  }
}

并对文档的多个建议进行索引，如下所示：

PUT music/_doc/1?refresh
{
  "suggest": [
    {
      "input": "Nirva test",
      "weight": 10
    },
    {
      "input": "Nirva hola",
      "weight": 3
    }
  ]
}

查询：您可以在 kibana 上执行此请求

POST music/_search?pretty
{
  "suggest": {
    "song-suggest": {
      "prefix": "nirv",        
      "completion": {         
          "field": "suggest"  
      }
    }
  }
}

，结果我只检索第一个值，而不是两个值。

我也在 kibana 开发工具上进行了测试，这是

    {
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "suggest" : {
    "song-suggest" : [
      {
        "text" : "nir",
        "offset" : 0,
        "length" : 3,
        "options" : [
          {
            "text" : "Nirvana test",
            "_index" : "music",
            "_type" : "_doc",
            "_id" : "1",
            "_score" : 10.0,
            "_source" : {
              "suggest" : [
                {
                  "input" : "Nirvana test",
                  "weight" : 10
                },
                {
                  "input" : "Nirvana best",
                  "weight" : 3
                }
              ]
            }
          }
        ]
      }
    ]
  }
}

预期结果：

"suggest" : {
    "song-suggest" : [
          {
        "text" : "nirvana",
        "offset" : 0,
        "length" : 7,
        "options" : [
          {
            "text" : "Nirvana test",
            "_index" : "music",
            "_type" : "_doc",
            "_id" : "1",
            "_score" : 10.0,
            "_source" : {
              "suggest" : [
                {
                  "input" : "Nirvana test",
                  "weight" : 10
                },
                {
                  "input" : "Nirvana best",
                  "weight" : 3
                }
              ]
            }
          }
        ]
      },
      {
        "text" : "nirvana b",
        "offset" : 0,
        "length" : 9,
        "options" : [
          {
            "text" : "Nirvana best",
            "_index" : "music",
            "_type" : "_doc",
            "_id" : "1",
            "_score" : 3.0,
            "_source" : {
              "suggest" : [
                {
                  "input" : "Nirvana test",
                  "weight" : 10
                },
                {
                  "input" : "Nirvana best",
                  "weight" : 3
                }
              ]
            }
          }
        ]
      }
    ]
  }

Answer 1

这是当前实现的默认行为。您可以查看 #31738。以下是解释为什么它只返回一份文档/建议的评论之一。

完成建议器在设计上是基于文档的，因此我们不能
每个匹配建议返回一个条目。据记载，它
返回文档而不是建议，并且可以对单个输入进行索引
多个建议（如果您的分析器中有同义词
实例），因此区分匹配和它的匹配并不简单
变化。此外，完成建议器不会访问所有
建议选择前N个，它有一个特殊的结构（a
加权 FST），可以按分数顺序访问建议
一旦找到足够的文档，就会提前终止查询。