I'm trying to update our mongo driver from an older version to the 2.4 version, but I've hit a problem.

Old code:

Query.Where("this.plan.sstats.used < this.plan.sstats.available")

New code:

builder.Filter.Where(t => t.Plan.StorageStats.UploadUsed < t.Plan.StorageStats.UploadAvailable)

Using the new code returns the following error, whereas the old code worked:

Additional information: Unsupported filter: ({plan.sstats.used} < {plan.sstats.available}).

Is there anything I can do to resolve this and retain the atomic nature of the old operation?