title: MongoDB Spring Pessimistic Lock
body: <p>I'm trying to implement a Pessimistic lock on my Spring Boot application running with a MongoDB instance.</p>
  <p>The problem:</p>
  <p>User A, select the Document ID 123
  User A, update the Document, append one field and Save it
  User B, select the Document ID 123 and need to wait User A finish the Save.</p>
  <p>Is it possible do with MongoDB?!</p>