How do i search within nested json without knowing the mapping.
I can do the search using this.
	{
"query": {
	    "match" : {
    	     "doc.Header.To": "http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous"
	    }
    }
}
But how to do search with just the key(To) without using(doc.Header.To)
and just get the content of key rather than the whole document.