elasticsearch - 如何在 Elasticsearch 中强制执行必填字段？

Question

我正在后端使用 Elasticsearch 构建一个 cms，我的团队决定使用 Elasticsearch 。我是新手。我主要在以前的项目中使用 mongoose 和 mongodb。在 mongodb 中，如果我错误地分配了一个字段或完全跳过了一个必填字段，mongodb 会抛出错误。

有没有办法在 elasticsearch 中强制执行必填字段？

Answer 1

没有内置功能，这将允许您在映射中定义必填/必填字段。许多人会建议您在客户端进行检查。

但是，在 Elasticsearch 5.x 中，您可以使用 Ingest 节点来实现这一点。

You can use ingest node to pre-process documents before the actual indexing takes place. This pre-processing happens by an ingest node that intercepts bulk and index requests, applies the transformations, and then passes the documents back to the index or bulk APIs.

To pre-process documents before indexing, you define a pipeline that specifies a series of processors. Each processor transforms the document in some way.

一个例子，显示了使用这种方法的可能性。

POST _ingest/pipeline/_simulate
{
  "pipeline": {
    "processors": [
      {
        "script": {
          "lang": "painless",
          "inline": "if (ctx.title == null) { throw new Exception('Document does not have the *title* field') }"
        }
      }
    ]
  },
  "docs": [
    {
      "_index": "index",
      "_type": "type",
      "_id": "1",
      "_source": {
        "title": "Elasticsearch 101"
      }
    },
    {
      "_index": "index",
      "_type": "type",
      "_id": "2",
      "_source": {
        "company": "Elastic"
      }
    }
  ]
}

更多信息请看这里 - https://www.elastic.co/guide/en/elasticsearch/reference/5.2/ingest.html