I used the Client -> Java codegen and the model source files for HasMore, Limit, and Offset are being created in the src\main\java\io\swagger\client\model directory. What specific codegen are you using which these are not getting created?
I generated the code from the models by using Swaggerhub. I imported your API into Swaggerhub and used Client -> Java as the codegen. Since you are using codegen-cli then you can report this issue in the codegen repository here https://github.com/swagger-api/swagger-codegen.