OAuth Token API Not Working In Elastic Search Even Security Disabled

问题

I'm new to Elastic search, using Elastic search version 7.7.1

I want to generate OAuth token by following Elastic Search documentation

When I've Tried below call through Kibana to get the OAuth token as per documentation:

 POST /_security/oauth2/token
    {
      "grant_type" : "password",
      "username" : "elastic",
      "password" : "password_for_elastic_super_user"
    }

then getting below Error:

{
  "error" : {
    "root_cause" : [
      {
        "type" : "invalid_index_name_exception",
        "reason" : "Invalid index name [_security], must not start with '_', '-', or '+'",
        "index_uuid" : "_na_",
        "index" : "_security"
      }
    ],
    "type" : "invalid_index_name_exception",
    "reason" : "Invalid index name [_security], must not start with '_', '-', or '+'",
    "index_uuid" : "_na_",
    "index" : "_security"
  },
  "status" : 400
}

Can anyone please help how to fix this?

回答1:

Elasticsearch creates the special index called .security-7 in version 7.X when x-pack security is enabled by setting xpack.security.enabled: true and to access this index, you need to give _security as index name when calling the security API like creating role, users etc

Below is one such example where I created the test role when x-pack security is enabled.

endpoint http://{{hostname}}:{{port}}/_security/role/test // notice _security

{
    "indices": [
        {
            "names": [
                "ngram*"
            ],
            "privileges": [
                "all"
            ]
        }
    ]
}

Note: In your case, it would not work unless x-pack-security is enabled and you can't create _security index as its a special index which can be started with _ and is created by x-pack only.

来源：https://stackoverflow.com/questions/62592786/oauth-token-api-not-working-in-elastic-search-even-security-disabled