Update index without losing data elasticsearch

Question

I tried to create the new index according to what I need, reindex according to the old, but it didn't work as expected and the data was not copied together

below the old index:

mappings: { 
  properties: {
    donor: {
      type: "nested",
      properties: {
        id: { type: "integer" },
        dateOfBirth: { type: "date" },
        profile: {
          type: "nested",
          properties: { 
            ...
          },
        },
      },
    }, 
  }
}

below the desired index:

mappings: { 
  properties: {
    id: { type: "integer" },
    dateOfBirth: { type: "date" },
    profile: {
      type: "nested",
      properties: { 
        ...
      },
    },
  }, 
}

Answer 1

当您更改对象结构时，您需要创建一个迁移程序来检索旧“文档结构”/对象中的所有文档，更改“文档结构”/对象并将它们插入新索引中。