Mapping core type String with norms.enabled and not_analyzed

[xavierfacq]

Hi all,

I have the following mapping for field:

"from_name_slug": {
  "index": "not_analyzed",
  "norms": {
    	"enabled": false
  },
  "type": "string"
}

But when I look at the mapping of my new created index I have:

"from_name_slug": {
  "include_in_all": false,
  "index": "not_analyzed",
  "type": "string"

}

The following attribute has disappear:

  "norms": {
   	"enabled": false
  }

Question: Is it normal ? does this attribute (norms.enabled) hidden by the not_analyzed ?

thx,
Xavier