Yeah, I actually copied that from [TermsBuilder](https://github.com/brwe/elasticsearch/commit/ad2d8ba848f3ffff77052f8bc1ca934e7aa9841b#diff-35782ff9843fd28b108b4c4a5833b60dL141). Checking for >=0 makes sense also but not building the parameter if it is the default makes sense too. I will add both checks?