ElasticSearch 无法从同一文档中获取多个建议值

Question

你能帮帮我吗？

我对 ElasticSearch 中的 Completion Suggester 有疑问

示例：我有这个映射：

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

并按如下方式为文档索引多个建议：

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

查询：你可以在kibana上做这个请求

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。

我也在 kibana 开发工具上做了测试，结果是这样

    {
  "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个 document/suggestion.

的评论之一

The completion suggester is document-based by design so we cannot return one entry per matching suggestion. It is documented that it returns documents not suggestions and a single input can be indexed in multiple suggestions (if you have synonyms in your analyzer for instance) so it is not trivial to differentiate a match from its variations. Also the completion suggester does not visit all suggestions to select the top N, it has a special structure (a weighted FST) that can visit suggestions in the order of their scores and early terminates the query once enough documents have been found.

ElasticSearch 无法从同一文档中获取多个建议值

ElasticSearch can't get multiple suggestor values from the same document

node.js

elasticsearch

autocomplete

autosuggest