ElasticSearch:preserve_position_increments 不工作

Question

根据文档

https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-completion.html

preserve_position_increments=false 应该使字符串中的连续关键字可搜索。但对我来说它不起作用。这是一个错误吗？在 Kibana 中重现的步骤:

PUT /example-index/
{
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0
  },
  "mappings": {
    "_doc": {
      "properties": {
        "example-suggest-field": {
          "type": "completion",
          "analyzer": "stop",
          "preserve_position_increments": false,
          "max_input_length": 50
        }
      }
    }
  }
}

PUT /example-index/_doc/1
{
  "example-suggest-field": [
        {
            "input": "Nevermind Nirvana",
            "weight" : 10
        }
    ]
}

POST /example-index/_search
{
  "suggest": {
    "bib-suggest" : {
        "prefix" : "nir",
        "completion" : {
            "field" : "example-suggest-field"
        }
    }
  }
}

POST /example-index/_search
{
  "suggest": {
    "bib-suggest" : {
        "prefix" : "nev",
        "completion" : {
            "field" : "example-suggest-field"
        }
    }
  }
}

如果是，我会做一个错误报告

Answer 1

这不是错误，preserve_position_increments 仅在您删除停用词并希望搜索停用词之后的标记时有用(即搜索 Beat 并找到甲壳虫乐队)。

在您的情况下，您可能应该索引 ["Nevermind", "Nirvana"] ，即标记数组。

如果您尝试索引 "The Nirvana"，您将通过搜索 nir 找到它