microsoftgraph-java-v6-backing-store

BackingStore.java

// get the object 
Event event = graphClient
    .me()
    .events() 
    .byEventId("event-id") 
    .get(); 

// the backing store will keep track that the property change and send the updated value. 
event.setRecurrence(null); // set to null  

// update the object 
graphClient.me()
    .events() 
    .byEventId("event-id") 
    .patch(event);