ElasticSearch clone BoolQueryBuilder object to another object by Value

I have a BoolQueryBuilder object in Java 8:

BoolQueryBuilder ogObject; // Having some clauses already

And I want to deep copy ogObject to another object, say copyObject and add more clauses to the copy, leaving the original object unmodified.

How do I do this?

Doing

BoolQueryBuilder copyObject = new BoolQueryBuilder();
copyObject = ogObject; 

copies it by reference.