Elasticsearch 7 : 文档 _id 的长度限制

PUT student
{
  "mappings" : {
    "properties" : {
      "name" : {
        "type" : "keyword"
      }
    }
  },
  "settings" : {
    "index" : {
      "number_of_shards" : 1
    }
  }
}

POST student/_doc/1
{
  "name": "1111"
}

POST student/_doc/0123456789
{
  "name": "2222"
}

POST student/_doc/0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789
{
  "name": "3333"
}

POST student/_doc/0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789_0123456789
{
  "name": "4444"
}

{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 648;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 648;"
  },
  "status": 400
}

POST student/_doc/零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九
{
  "name": "5555"
}

POST student/_doc/零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零一二三四五六七八九零
{
  "name": "5555"
}

{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 513;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: id is too long, must be no longer than 512 bytes but was: 513;"
  },
  "status": 400
}