Validation Failed: 1: mapping type is missing; in elasticsearch

I'm was an error same this questuion. As the answer of this question i'm trying to set correct url to PUT index mapping, but it's not work on my instance:

$ cat mapping.json | http PUT myhost:9200/acastest/_mapping 

result:

HTTP/1.1 400 Bad Request
Content-Length: 247
Content-Type: application/json; charset=UTF-8

{
    "error": {
        "reason": "Validation Failed: 1: mapping type is missing;", 
        "root_cause": [
            {
                "reason": "Validation Failed: 1: mapping type is missing;", 
                "type": "action_request_validation_exception"
            }
        ], 
        "type": "action_request_validation_exception"
    }, 
    "status": 400
}

and trying with this:

$ cat mapping.json | http PUT myhost:9200/acastest/articles/_mapping 

result:

HTTP/1.1 400 Bad Request
Content-Length: 3969
Content-Type: application/json; charset=UTF-8

{
    "error": {
        "reason": "Root mapping definition has unsupported parameters:  [mappings : {articles={properties={category_en={type=string, index=not_analyzed},blah blah blah", 
        "root_cause": [
            {
                "reason": "Root mapping definition has unsupported parameters:  [mappings : {articles={properties={category_en={type=string, index=not_analyzed}, category_fa={blahblah blah", 
                "type": "mapper_parsing_exception"
            }
        ], 
        "type": "mapper_parsing_exception"
    }, 
    "status": 400
}

Elasticsearch config:

"version": {

    "number": "2.1.1",
    "build_hash": "40e2c53a6b6c2972b3d13846e450e66f4375bd71",
    "build_timestamp": "2015-12-15T13:05:55Z",
    "build_snapshot": false,
    "lucene_version": "5.3.1"

},

and my mapping file like this:

{ 
    "mappings": {
            "articles": {
                "properties": {
                    "category_en": {
                        "type": "string",
                        "index": "not_analyzed"
                    },
                    "category_fa": {
                        "type": "string",
                        "index": "not_analyzed"
                    },
                    blah
                    blah
                    blah
                }
            }
        }
}

To see complete mapping file, check this How can i fix it?