Removing subfield in concrete mapping

Elastic Stack Elasticsearch
#1

I'm using the following index template (derived from the Logstash index
template):

{
  "template": "logstash-*",
  ...
  "mappings": {
    "_default_": {
      ...
      "dynamic_templates": [
        {
          "string_fields": {
            "match": "*",
            "match_mapping_type": "string",
            "mapping": {
              "type": "string",
              "index": "analyzed",
              "omit_norms": true,
              "fields": {
                "raw": {
                  "type": "string",
                  "index": "not_analyzed",
                  "ignore_above": 256
                }
              }
            }
          }
        }
      ]
    },
    "gerrit_event": {
      "dynamic_templates": [
        {
          "string_fields": {
            "match": "*",
            "match_mapping_type": "string",
            "mapping": {
              "type": "string",
              "index": "not_analyzed",
              "omit_norms": true,
              "fields": {}
            }
          }
        }
      ]
    }
  }
  ...
}

I thought this would've effectively deleted the .raw subfield for
gerrit_event documents, but that doesn't happen:

$ curl --silent -XGET 'http://localhost:9200/logstash-2015.04.25/_mapping/gerrit_event?pretty' | head -n 22
{
"logstash-2015.04.25" : {
"mappings" : {
"gerrit_event" : {
"dynamic_templates" : [ {
"string_fields" : {
"mapping" : {
"index" : "not_analyzed",
"type" : "string",
"fields" : {
"raw" : {
"index" : "not_analyzed",
"ignore_above" : 256,
"type" : "string"
}
},
"omit_norms" : true
},
"match" : "*",
"match_mapping_type" : "string"
}
} ],

Is this expected? If so, why, and is there another way to remove
accomplish what I want, i.e. have a .raw subfield for dynamically mapped
string fields in all types but not gerrit_event? (Without removing the
subfield from default and adding it in many other places, obviously.)

--
Magnus Bäck | Software Engineer, Development Tools
magnus.back@sonymobile.com | Sony Mobile Communications

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#2