Query matadata using jest

Hello,

My query result (match all) using head plugin search:
locahost:9200/mydb/mycollect/_search

{

"took": 1,
"timed_out": false,
"_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
},
"hits": {
    "total": 1,
    "max_score": 1,
    "hits": [
        {
            "_index": "mydb",
            "_type": "mycollect",
            "_id": "54ac6333b760d23c7635ce0b",
            "_score": 1,
            "_source": {
                "content": {
                    "_content_type": "String",
                    "_title": "def.xml",
                    "_content": 

"PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9InllcyI"
},
"filename": "def.xml",
"contentType": "String",
"md5": "4f5cfde85d1b6f48658b82af980714c7",
"length": 2438,
"chunkSize": 261120,
"uploadDate": "2015-01-06T22:35:31.289Z",
"metadata": {
"Description": "def XML File",
"tags": [
"def"
,
"XML"
]
}
}
}
]
}

}

I'm able to find "filename". But wondering how do I fetch "Description" &
"tags" fields from "metadata".

I'm using Jest client to execute search which is not returning
"Description" field contents:

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.wildcardQuery("Description", "*"));

     Search search = new Search.Builder(searchSourceBuilder.toString())
                                     // multiple index or types can be 

added.
.addIndex("mydb")
.addType("mycollect")
.build();

Appreciate your help.

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