title: How to remove duplicate from mongodb when there is not unique key in collection.?
body: <p>How should I remove duplicate from mongodb collection when there is no unique element?</p>
  
  <p>I want to do this in using Java driver.
  In that below pic some record are same. I want to remove that records. Time is not unique key here.</p>
  
  <p><img src="https://i.stack.imgur.com/hqfiA.jpg" alt="enter image description here"></p>
  
  <p>P.S.: I just presented data in table form. there are actually in json array form.</p>