code: function fieldRelocate(elem, field, oldParent, newParent) {
          try {
              $(exports).triggerHandler('fieldRelocate', [elem, field, oldParent, newParent]);
          } catch (err) {
              console.error(err);
          }
          _currentOperation.ops.push({
              op: OP_FIELD_RELOCATE,
              arg: {
                  _id: elem._id,
                  f: field,
                  op: oldParent._id,
                  np: newParent._id
              }
          });
      }
docs: Relocate an element to another parent.
  
  @param {Element} elem Element to be relocated
  @param {string} field Field name of parent
  @param {number} oldParent Current parent
  @param {number} newParent New parent to be located in