Elasticsearch 更喜欢这个查询使用 like_text

Question

我在使用 more like this 查询时遇到了一些挫折。

这是我创建的索引：

curl -XPUT 'http://127.0.0.1:9200/food/' -d 
'{
  "mappings": {
    "fruit": {
      "properties": {
        "term": {
          "type": "string",
          "term_vector": "yes"
        }
      }
    }
  }
}'

下面是该索引中的一段数据示例：

{
  "_index": "food",
  "_type": "fruit",
  "_id": "2",
  "_score": 1,
  "_source": {
    "term": "yellow",
    "property_ids": [
      1
    ],
    "id": 2
  }
}

最后这里是我用来尝试 return 数据的更像这个查询：

curl -XGET 'http://127.0.0.1:9200/food/_search' -d '{
  "query": {
    "more_like_this": {
      "fields": [
        "term"
      ],
      "like_text": "yellow",
      "min_term_freq": 1,
      "max_query_terms": 12
    }
  }
}
'

问题是当我执行此搜索时没有返回任何结果：

{"took":2,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max_score":null,"hits":[]}}%

如果我只对 "yellow" 执行标准通配符查询，我会返回该结果。我错过了什么？

Answer 1

默认情况下 min_doc_freq 为 5 (check doc) 因此，您的查询不起作用，因为您的索引不包含至少 5 个 term 属性的文档持有 yellow。因此，在您的查询中将 min_doc_freq 设置为 1，它应该可以工作。示例：

{
    "query": {
        "more_like_this": {
            "fields": [
                "term"
             ],
             "like_text": "yellow",
             "min_term_freq": 1,
             "min_doc_freq": 1,
             "max_query_terms": 12
         }
    }
}

Elasticsearch 更喜欢这个查询使用 like_text

Elasticsearch more like this query using like_text

elasticsearch