title: Query Firebase Firestore documents by the ID
body: <p>As I got from 'Cloud Firestore Data Model' guide "each document is identified by a name." Is it possible to query a collection by that document identifier (which is the name or ID)?</p>
  
  <p>For example, documents in the collection "Things" have IDs: 0, 1, 2 etc.:</p>
  
  <p><a href="https://i.stack.imgur.com/bQceM.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/bQceM.jpg" alt="enter image description here"></a></p>
  
  <p>Is it possible to query documents which IDs are less than 100?</p>