title: How to get multiple document using array of MongoDb id?
body: <p>I have an array of ids and I want to get  all document of them at once. For that I am writing but it return 0 records.</p>
  
  <p>How can I search using multiple Ids ?</p>
  
  <pre><code>db.getCollection('feed').find({"_id" : { "$in" : [  
  "55880c251df42d0466919268","55bf528e69b70ae79be35006" ]}})
  </code></pre>
  
  <p>I am able to get records by passing single id like               </p>
  
  <pre><code>db.getCollection('feed').find({"_id":ObjectId("55880c251df42d0466919268")})
  </code></pre>