带有小写过滤器的自定义分析器无法按预期工作

Question

我有一个名为 custom_raw_analyzer 的简单自定义分析器，如下所示：

$ curl 'http://localhost:9200/test/_settings?pretty'

  "test" : {
    "settings" : {
      "index" : {
        "uuid" : "_M-KXnZSQXyFH7cqbh6lsw",
        "number_of_replicas" : "1",
        "analysis" : {
          "analyzer" : {
            "custom_raw_analyzer" : {
              "type" : "custom",
              "filters" : [ "lowercase" ],
              "tokenizer" : "keyword"
            }
          }
        },
        "number_of_shards" : "5",
        "refresh_interval" : "10s",
        "version" : {
          "created" : "1030499"
        }
      }
    }
  }
}

但是当我对一个随机字符串进行测试时，输出的标记不是小写的：

$ curl -XGET 'localhost:9200/test/_analyze?analyzer=custom_raw_analyzer' -d "This Is A Test"

结果：

{
  "tokens": [
    {
      "token": "This Is A Test",
      "start_offset": 0,
      "end_offset": 14,
      "type": "word",
      "position": 1
    }
  ]
}

任何人都可以解释为什么吗？

Answer 1

我认为你打错了：

"filters" : [ "lowercase" ],

不应有尾随 "s":

"filter" : [ "lowercase" ],

带有小写过滤器的自定义分析器无法按预期工作

Custom analyzer with lowercase filter doesn't work as expected

elasticsearch

query-analyzer