ElasticSearch：重用嵌套类型映射

Question

我有一个具有相同复杂类型属性的对象，我想在ElastcSearch中编制索引。

例如：

Root {
  a : Foo
  b : Foo
  c : Foo
}

Foo {
  x : Bar
  y : Bar
  z : Bar
}

Bar {
   ...
}

etc.

其中Root是root，Foo, Bar是嵌套对象。

如何避免在ElasticSearch映射JSON文件中复制类型Foo和Bar的嵌套类型定义？

Answer 1

您可以使用dynamic_templates：

PUT roots
{
  "mappings": {
    "dynamic_templates": [
      {
        "bar_template": {
          "path_match": "*.*.*",
          "match_mapping_type": "object",
          "mapping": {
            "type": "nested",
            "properties": {
              "bar1": {
                "type": "integer"
              }
            }
          }
        }
      },
      {
        "foo_template": {
          "path_match": "*.*",
          "match_mapping_type": "object",
          "mapping": {
            "type": "nested"
          }
        }
      }
    ],
    "properties": {
      "root": {
        "type": "nested"
      }
    }
  }
}

POST roots/_doc
{
  "root": {
    "a": {
      "x": {
        "bar1": 1
      },
      "y": {
        "bar1": 1
      }
    },
    "b": {
      "x": {
        "bar1": 1
      },
      "y": {
        "bar1": 1
      }
    },
    "c": {
      "x": {
        "bar1": 1
      },
      "y": {
        "bar1": 1
      }
    }
  }
}

然后为您生成以下映射：

GET roots/_mapping
{
  "roots" : {
    "mappings" : {
      "dynamic_templates" : [
        {
          "bar_template" : {
            "path_match" : "*.*.*",
            "match_mapping_type" : "object",
            "mapping" : {
              "properties" : {
                "bar1" : {
                  "type" : "integer"
                }
              },
              "type" : "nested"
            }
          }
        },
        {
          "foo_template" : {
            "path_match" : "*.*",
            "match_mapping_type" : "object",
            "mapping" : {
              "type" : "nested"
            }
          }
        }
      ],
      "properties" : {
        "root" : {
          "type" : "nested",
          "properties" : {
            "a" : {
              "type" : "nested",
              "properties" : {
                "x" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                },
                "y" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                }
              }
            },
            "b" : {
              "type" : "nested",
              "properties" : {
                "x" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                },
                "y" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                }
              }
            },
            "c" : {
              "type" : "nested",
              "properties" : {
                "x" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                },
                "y" : {
                  "type" : "nested",
                  "properties" : {
                    "bar1" : {
                      "type" : "integer"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}