code: public static EntityUnlinkOperation unlinkDeliveryPolicy(String assetId,
              String adpId) {
          return new EntityUnlinkOperation(ENTITY_SET, assetId, "DeliveryPolicies", adpId);
      }
docs: unlink an asset delivery policy
  
  @param assetId
  the asset id
  @param adpId
  the asset delivery policy id
  @return the entity action operation