code: public void remove(final DBObject query) {
          if (query == null) {
              throw new IllegalArgumentException("query can not be null");
          }
  
          for (final GridFSDBFile f : find(query)) {
              f.remove();
          }
      }
docs: Removes all files matching the given query.
  
  @param query filter to apply
  @throws com.mongodb.MongoException if the operation fails