SynchronizedUnion wrapper in Theta module was removed since it was not 
compatible with the new API of Union. Synchronization was added to aggregate() 
and get() methods in SketchAggregator instead.
Also I noticed that there is no synchronization in the SketchBufferAggregator 
like in other modules. Is this an oversight or maybe the synchronization is not 
needed in other modules as well?
@will-lauer do you happen to know?

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