YouXiang-Wang

1. 在您的案例中使用ElasicSearch没有问题。
2. 创建索引的脚本

PUT /city_index
{
  "mappings": {
  "citydata": {
    "dynamic": "false",
    "properties": {
      "id": {
        "type": "keyword"

      },
      "cited_by": {
        "type": "object",
        "properties": {
          "id": {
            "type": "keyword"
          }
        }
      }
    }
  }
  }
}