How to upgrade kong from V0.13.1 to V1.0.0


We are using opensource Kong v0.13.1 with Cassandra as back-end for our setup planning to upgrade it to V1.0.0
As per official documentation you can’t directly upgrade from 0.13 to 1.0 it should pass through V0.14.1

We are able to upgrade Kong to V0.14.1 however V1.0.0 is failed with api related exceptions,the exception logs are as follows,

"cannot run migrations: you have `api` entities in your database; please convert them to `routes` and `services` 
prior to migrating to Kong 1.0."

How to convert api entities to routes and services.