ElasticSearch: preserve_position_increments不工作

Question

根据文件所说

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。但对我来说这是行不通的。这是一个bug吗？在Kibana复制的步骤：

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，我会写一份错误报告

Answer 1

这不是bug，只有当你删除停用词并且想要搜索停用词后面的令牌时(即搜索Beat并查找The Beatles)，preserve_position_increments才有用。

在您的例子中，您可能应该改为索引["Nevermind", "Nirvana"]，即标记数组。

如果您尝试为"The Nirvana"建立索引，则可以通过搜索nir来找到它