Some important JSON config properties does not work

Description

First of all your documentation does not include JSON config example but only XML. For JSON config shown below only sourceFolder and modelPackage does the job but the other properties still generate everything. For my discovery i even tried "generateModels": false and models were still generated. The other problem is that i only want model classes nothing else and this configuration is also generates other files like VERSION and some gradle project configuration files.

Swagger-codegen version

2.4.2

Swagger declaration file content or url

{
  "sourceFolder": "sdk/kotlin",
  "modelPackage": "com.myproject.models",
  "generateModels": true,
  "generateModelTests": false,
  "generateModelDocumentation": false,
  "generateApis": false,
  "generateSupportingFiles": false,
  "addCompileSourceRoot": false,
  "supportingFilesToGenerate": false
}

Command line used for Kotlin generation

swagger-codegen generate -l kotlin -i swagger.api.yaml -c swagger-codegen-android.config.json

Suggest a fix/enhancement

for generating only models i found only solution by using -D

swagger-codegen generate -l kotlin -Dmodels -DmodelDocs=false -DmodelTests=false -i swagger.api.yaml -c swagger-codegen-android.config.json

Start with the Kotlin generation command and swagger-codegen-android.config.json, then trace how the JSON properties are applied. Reproduce the behavior with the supplied command and verify that only models are generated, with model tests, documentation, APIs, and supporting files disabled; confirm the JSON configuration matches the existing -D behavior.