anchor.diff:  [float]
   [[ref-realm-settings]]
   ===== Settings valid for all realms
  -
  -`type`::
  -The type of the realm: `native`, `ldap`, `active_directory`, `pki`, or `file`. Required.
   
   `order`::
   The priority of the realm within the realm chain. Realms with a lower order are
  
positive.code: ----------------------------------------
  xpack.security.authc.realms:
  
      native.realm1:
          order: 0
          ...
  
  
negative.code:         ...
      ...
  ----------------------------------------
  <1> Specifies the type of realm (for example, `native`, `ldap`,
  `active_directory`, `pki`, `file`, `kerberos`, `saml`) and the realm name. This
  information is required.
  
  The valid settings vary depending on the realm type. For more
  information, see <<setting-up-authentication>>.
  