Grant users access to APM Server indices

To enable users to access the indices APM Server creates, grant them read and view_index_metadata privileges on the APM Server indices. If they’re using Kibana, they also need the kibana_user role.

X-Pack security provides a built-in role called apm_user that you can explicitly assign to users. This role grants them the necessary read and view_index_metadata privileges on the APM Server indices.

Assign your users the apm_user role so they can access the APM Server indices. For Kibana users who need to visualize the data, also assign the kibana_user role:
1. If you’re using the native realm, you can assign roles with the Management > Users UI in Kibana or through the user API. For example, the following request grants apm_account the apm_user and kibana_user roles:
```
POST /_security/user/apm_account
{
  "password" : "YOUR_PASSWORD",
  "roles" : [ "apm_user","kibana_user"],
  "full_name" : "APM Server account"
}
```
2. If you’re using the LDAP, Active Directory, or PKI realms, you assign the roles in the role_mapping.yml configuration file. For example, the following snippet grants apm_account the apm_user and kibana_user roles:
```
apm_user:
  - "cn=apm_account,dc=example,dc=com"
kibana_user:
  - "cn=apm_account,dc=example,dc=com"
```
  For more information, see Using Role Mapping Files.

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