use SAMPLE_embed

db.label.insertMany ([
{first_label: 'a', second_label: 'a', label_id: 1,
  hit_list: [
  	   {color: "red", hits: 1, hit_time: '2000-01-01'},
	   {color: "red", hits: 10, hit_time: '2010-01-01'}
	   ]
  },

{first_label:'a', second_label: 'b',label_id: 2,
hit_list : [
	  {color: "green", hits: 2, hit_time: '2002-02-02'},	
	  {color: "green", hits: 20, hit_time: '2012-02-02'}
	   ],
},

{first_label:'a', second_label: 'c',label_id: 3,
hit_list : [
	 {color: "blue", hits: 3, hit_time: '2003-03-03'},
	 {color: "blue", hits: 30, hit_time: '2013-03-03'}	 
	 ]
},

{first_label:'b', second_label: 'b',label_id: 4,
hit_list: [
	  { color: "red", hits: 4, hit_time: '2004-04-04'},
	  { color: "red", hits: 40, hit_time: '2014-04-04'}
	  ]
},

{first_label:'b ', second_label: 'c',label_id: 5,
hit_list: [
	  {color: "green", hits: 5, hit_time: '2005-05-05'},
	  {color: "green", hits: 50, hit_time: '2015-05-05'}
	  ]
},

{first_label:'c', second_label: 'c',label_id: 6}
]
);

db.label.createIndex({label_id: 1});