Indexing CIDR block e.g.: 192.168.1.0/24

Hi

Here is the mapping :

PUT http://192.168.128.32:7013/testindex

{
  "mappings": {
    "_doc": {
      "properties": {
        "ip_addr": {
          "type": "ip"
        }
      }
    }
  }
}

Here is the index PUT request:

PUT http://192.168.128.32:7013/testindex/_doc/2
{
  "ip_addr": "192.168.1.0/24"
}

And the request fails with ...

"error": {
    "root_cause": [
        {
            "type": "mapper_parsing_exception",
            "reason": "failed to parse [ip_addr]"
        }
    ],
    "type": "mapper_parsing_exception",
    "reason": "failed to parse [ip_addr]",
    "caused_by": {
        "type": "illegal_argument_exception",
        "reason": "'192.168.1.0/24' is not an IP string literal."
    }
}