Use java Api to set a document's field as _id

[Chia-Eng Chang]

I want to ask if the unique field _id be assigned by certain field within 
document. I see with Rest, it can achieve by "path":

    {
        "tweet" : {
            "_id" : {
               "path" : "post_id"
           }
        }
    }

But if I want to do it with java API, is there any way to achieve it?

    Map<String, Object> MapA= new HashMap<String, Object>();
    MapA=MapProcessor(MapA);

    client.prepareIndex("index","type").setSource(MapA).execute().actionGet();

How could I modify my code to assign certain field in Map to become _id of 
this type?

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