elasticsearch analyzer : invalid stopword syntax that should work

gistfile1.sh

# Remove old data
curl -XDELETE "http://localhost:9200/french"
 
# Create index with custom analyzer
# this syntax is an extrapolation of 
# http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/using-stopwords.html
#
# but apparently if an analyzer is of type "custom", 
# it requires the stopwords to be defined as a filter
curl -XPOST "http://localhost:9200/french/" -d '
{
  "settings":{
    "index":{
      "analysis":{
        "tokenizer" : {
          "host_tokenizer" : {
            "type": "pattern",
            "pattern": "[a-zA-Z0-9]+",
            "group": 0
          }
        },
        "analyzer":{
          "host_analyzer":{
            "type":"custom",
            "tokenizer" : "host_tokenizer",
            "stopwords": ["www", "fr", "com"]
          }
        }
      }
    }
  }
}'

# this shows the stopwords "www", "fr", and "com" are not removed
curl -XGET 'http://localhost:9200/french/_analyze?analyzer=host_analyzer' -d 'www.google.fr.com'