Removing TTL during document update

I am trying to remove the TTL setting when doing a document update
(doc_as_upsert) via the java api. I do the following:

UpdateRequestBuilder b = new UpdateRequestBuilder(client);

b.setDocAsUpsert(true);

b.setDoc(dataMap);
...

UpdateRequest request = b.request();

request.doc().ttl(null);

...

If I set a value here instead of null, the TTL is successfully updated.
However passing null doesn't seem to remove the TTL. Is there another way
to do this? The comments for the ttl(Long) method seem to indicate passing
null should reset the TTL (I am on 0.90.11)

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