docs: function(metacache, callback) {            
              var funcs = [];
              
              for (var processor in metacache) {
                  if (processor !== '_id') {
                      var cached = metacache[processor];
                      funcs.push(function(callback) {
                          self.cache.delete(cached, callback);
                      });
                  }
              }
              
              async.parallel(funcs, callback);
          }