elasticsearch - 在 ElasticSearch 中使用动态键映射 map

Question

我正在尝试将此类数据存储在 Elasticsearch 索引中

{
  "id": "5644596f9bf67301645999d9",
  "headline": "Scientists Look Beyond Solar System to Study Planet",
  "renditions": {
    "baseImage": {
      "height": 933,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 1400
    },
    "preview": {
      "height": 500,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 400
    },
    "thumbnail": {
      "height": 150,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 125
    }
  }
}

然而，映射不断为“再现”的所有不同子级添加唯一 block 。

理想情况下，我会为“再现”定义一种子类型，然后断言它下面的所有对象都应该是这样。

这可能吗？

我研究过动态映射，但对它有点困惑...

Answer 1

您可以使用动态模板尝试此映射:

PUT /test

PUT /test/_mapping/test
{
   "properties": {
      "id": {
         "type": "string"
      },
      "headline": {
         "type": "string"
      }
   },
   "dynamic_templates": [
      {
         "renditions_objects": {
            "mapping": {
               "dynamic": "strict",
               "type": "object",
               "properties": {
                  "height": {
                     "type": "integer"
                  },
                  "href": {
                     "type": "string"
                  },
                  "mimetype": {
                     "type": "string"
                  },
                  "width": {
                     "type": "integer"
                  }
               }
            },
           "match_mapping_type": "object",
           "path_match": "renditions.*"            
         }      
      }
   ]
}

线

"dynamic": "strict",

确保您不能索引任何存在额外字段的文档。如果您尝试索引这样的内容，该过程将失败:

POST /test/test
{
  "id": "5644596f9bf67301645999d9",
  "headline": "Scientists Look Beyond Solar System to Study Planet",
  "renditions": {
    "baseImage": {
      "height": 933,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 1400,
      "dummy": 12
    },
    "preview": {
      "height": 500,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 400
    },
    "thumbnail": {
      "height": 150,
      "href": "www.imgur.com/animage",
      "mimetype": "image/jpeg",
      "width": 125
    }
  }
}

注意 baseImage 中额外的 dummy 键。它会因错误而失败:

{
   "error": "StrictDynamicMappingException[mapping set to strict, dynamic introduction of [dummy] within [renditions.baseImage] is not allowed]",
   "status": 400
}

如果你想让它轻松一点，允许这样的文档被索引，但不希望额外的字段被索引，那么将dynamic设置为false。这不会在索引此类文档时导致任何失败，而且额外的字段将出现在 _source 字段中。但是，该字段不会被索引，您将无法对该字段执行任何查询或筛选。希望这有帮助