elasticsearch - 在 Elasticsearch 中定义字符串数组字段

Question

如何定义一个接受诸如[“A”，“B”，“C”]之类的字符串数组的字段。

我尝试执行以下操作:
在索引中创建了一个字段:

    {
      "properties": 
      {
        "date": {"type": "date"},
        "imageUrls": { "type": "nested" },
        }
    }

我写文件
..../_doc/1
方法:POST

body :

{
    "imageUrls": ["A", "B", "C"]
}

总是出现此错误:

{
    "error": {
        "root_cause": [
            {
                "type": "mapper_parsing_exception",
                "reason": "object mapping for [imageUrls] tried to parse field [null] as object, but found a concrete value"
            }
        ],
        "type": "mapper_parsing_exception",
        "reason": "object mapping for [imageUrls] tried to parse field [null] as object, but found a concrete value"
    },
    "status": 400
}

Answer 1

嵌套映射中不允许使用单个值。从docs-系统

allows arrays of objects to be indexed in a way that they can be queried independently of each other.

也就是说，

PUT ahm
{
  "mappings": {
    "properties": {
      "date": {
        "type": "date"
      },
      "imageUrls": {
        "type": "nested",
        "properties": {
          "url": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword"
              }
            }
          }
        }
      }
    }
  }
}

然后

POST ahm/_doc
{
  "imageUrls": [
    {
      "url": "A"
    },
    {
      "url": "B"
    },
    {
      "url": "C"
    }
  ]
}

这是非常荒谬的，但是如果将更多属性添加到数组对象，它将开始变得有意义。