If non-geo fields are not multikey index, we can intersect bounds over non-geo field of compound geo index. Although geo index generates more than one geohash index key for a document, geo index is not "multikey" in terms of query planning, because the predicate of geo field is limited to the same semantic of "$elemMatch", i.e. whether any geohash key of a document is in these intervals. Thus, it's possible to intersect bounds over non-geo field of compound geo index, if they are not "multikey".