title: How to filter collections in Firebase Firestore?
body: <p>I have below FireStore data</p>
  
  <p><a href="https://i.stack.imgur.com/fZzZm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fZzZm.png" alt="enter image description here"></a></p>
  
  <p>And I have a list <code>specialUsers</code> which is defined as</p>
  
  <pre><code>val specialUsers = arrayOf("stark@gmail.com", "lannester@gmail.com")
  </code></pre>
  
  <p>So I want to get collections which are in the <code>specialUsers</code>, something like</p>
  
  <pre><code>collection("users").whereIn(specialUsers)
  </code></pre>
  
  <p>But, couldn't find any documentation related to this. How can I perform above intention in Firestore?</p>