Using existing field for mapping

[Ayush]

I am new to elastic search, I have created an index "cmn" with a type 
"mention". I am trying to import data from my existing solr to 
elasticsearch, so I want to map an existing field to the _id field.

I have created the following file under /config/mappings/cmn/,

    {
        "mappings": {
    "mentions":{
"_id" : {
            "path" : "docKey"
        }
          }
        }
    }

But this doesn't seem to be working, every time I index a record the 
following _id is created,

            "_index": "cmn",
            "_type": "mentions",
            "_id": "k4E0dJr6Re2Z39HAIjYMmg",
            "_score": 1

Also, the mapping is not reflects. I have also tried the following option,

    {
        "mappings": {
"_id" : {
            "path" : "docKey"
        }
        }
    }

SAMPLE DOCUMENT: Basically a tweet.

     {
               "usrCreatedDate": "2012-01-24 21:34:47",
               "sex": "U",
               "listedCnt": 2,
               "follCnt": 432,
               "state": "Southampton",
               "classified": 0,
               "favCnt": 468,
               "timeZone": "Casablanca",
               "twitterId": 473333038,
               "lang": "en",
               "stnostem": "#ootd #ootw #fashion #styling #photography 
#white #pink #playsuit #prada #sunny #spring http://t.co/YbPFrXlpuh";,
               "sourceId": "tw",
               "timestamp": "2014-04-09T22:58:00.396Z",
               "sentiment": 0,
               "updatedOnGMTDate": "2014-04-09T22:56:57.000Z",
               "userLocation": "Southampton",
               "age": 0,
               "priorityScore": 57.4700012207031,
               "statusCnt": 14612,
               "name": "YazzyK",
               "profilePicUrl": 
"http://pbs.twimg.com/profile_images/453578494556270594/orsA0pKi_normal.jpeg";,
               "mentions": "",
               "sourceStripped": "Instagram",
               "collectionName": "STREAMING",
               "tags": "557/161/193/197",
               "msgid": 1397084280396.33,
               "_version_": 1464949081784713200,
               "url2": 
"{\"urls\":[{\"url\":\"http://t.co/YbPFrXlpuh\",\"expandedURL\":\"http://instagram.com/p/mliZbgxVZm/\",\"displayURL\":\"instagram.com/p/mliZbgxVZm/\",\"start\":88,\"end\":110}]}";,
               "links": "http://t.co/YbPFrXlpuh";,
               "retweetedStatus": "",
               "twtScreenName": "YazKader",
               "postId": "454030232501358592",
               "country": "Bermuda",
               "message": "#ootd #ootw #fashion #styling #photography 
#white #pink #playsuit #prada #sunny #spring http://t.co/YbPFrXlpuh";,
               "source": "<a href=\"http://instagram.com\"; 
rel=\"nofollow\">Instagram</a>",
               "parentStatusId": -1,
               "bio": "Live and breathe Fashion. Persian and proud- 
Instagram: @Yazkader",
               "createdOnGMTDate": "2014-04-09T22:56:57.000Z",
               "searchText": "#ootd #ootw #fashion #styling #photography 
#white #pink #playsuit #prada #sunny #spring http://t.co/YbPFrXlpuh";,
               "isFavorited": "False",
               "frenCnt": 214,
               "docKey": "tw_454030232501358592"
            }
Also, how can we create unique mapping for each "TYPE" and not just the 
index.

Thanks

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