elasticsearch - 如何处理多词同义词

Question

我试图了解我在两种情况下在Elastic搜索中获得的结果。我定义了以下同义词列表:

"product insert, product inserts, qc package, qc package inserts, qc package insert, package insert => package inserts"

我希望将箭头左侧的所有术语都视为右侧的术语。这是我的索引设置:

PUT /test_index
{
  "settings": {
    "index": {
      "analysis": {
        "filter": {
          "my_syn_filt": {
            "tokenizer": "keyword",
            "type": "synonym",
            "synonyms": [
              "product insert, product inserts, package inserts, qc package, qc packages, qc insert, qc inserts, package insert, qc package insert, qc package inserts => package inserts"
            ]
          }
        },
        "analyzer": {
          "my_synonyms": {
            "filter": [
              "lowercase",
              "my_syn_filt"
            ],
            "tokenizer": "keyword"
          }
        }
      }
    }
  }
}

我的问题是，当我搜索几个词(“产品插入”)时，没有得到预期的结果。但是“产品插入”效果很好。我的配置有问题吗？我错过了一步吗？

Answer 1

我已经测试了您的设置，但我猜您尚未将my_synonyms分析器分配给您的字段。

在不知道如何定义映射的情况下，我将向您展示一个有效的示例:

假设您的映射和设置如下所示:

PUT /my_index
{
  "mappings": {
    "properties": {
      "data": {
        "type": "text",
        "analyzer": "my_synonyms",  => my guess
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      }
    }
  },
  "settings": {
    "index": {
      "analysis": {
        "filter": {
          "my_syn_filt": {
            "tokenizer": "keyword",
            "type": "synonym",
            "synonyms": [
              "product insert, product inserts, package inserts, qc package, qc packages, qc insert, qc inserts, package insert, qc package insert, qc package inserts => package inserts"
            ]
          }
        },
        "analyzer": {
          "my_synonyms": {
            "filter": [
              "lowercase",
              "my_syn_filt"
            ],
            "tokenizer": "keyword"
          }
        }
      }
    }
  }
}

索引一些数据:

POST my_index/_doc/1
{
  "data":"package inserts"
}

查询同义词的实用程序:

GET my_index/_search
{
  "query": {
      "match": {
        "data": "product insert"
      }
  }
}

结果:

{
 "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "my_index",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 0.2876821,
        "_source" : {
          "data" : "package inserts"
        }
      }
    ]
  }
}

如果不将分析器分配给您的字段，则只有在搜索查询中包含package或inserts这两个词之一时，您才会获得结果。实际上，没有使用分析器的情况下，您将执行使用默认的elasticsearch match分析器的简单standard查询。

希望这可以帮助