[codegen, JAVA] Trying to generate mustache template variables but get full codegen output instead

Description

I'm following the information here: https://github.com/swagger-api/swagger-codegen/wiki/Mustache-Template-Variables

Attempting to generate either the models or the operations will load the full codegen folder instead of a json file with variables as expected

its as if the -DdebugOperations or -DdebugModels flags are not being recognized

Swagger-codegen version

2.4.0 (master)

Command line used for generation

java -DdebugOperations -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i http://petstore.swagger.io/v2/swagger.json -l csharp -o operations.json

Steps to reproduce

• Check out master (2.4.0)
• Run mvn clean install -DskipTests
• run above command to attempt to generate operations variables into a file called operations.json, note that a directory is created with full codegen output instead. The same occurs when trying to generate models

Start with the CLI generation path built by modules/swagger-codegen-cli and reproduce the command using -DdebugOperations, then compare it with -DdebugModels. Verify whether these flags are recognized during the Maven-built CLI invocation. Done means the requested debug output is written as a JSON file instead of a full generated code directory.