Api Versioning. Use the default version from ApiVersionConfigurer #3159

Is your feature request related to a problem? Please describe.

I’m using Swagger (OpenAPI) in a Spring Boot 4 application with API versioning. The OpenAPI specification is not generated correctly when the version is not explicitly specified in the @GetMapping or similar annotations.

Describe the solution you'd like

I expect it to automatically apply the default version defined in my ApiVersionConfigurer:

@Configuration
public class ApplicationWebConfiguration implements WebMvcConfigurer {
    @Override
    public void configureApiVersioning(ApiVersionConfigurer configurer) {
        configurer.setDefaultVersion("1");
    }
}

Specifically, if no version is explicitly declared in the @GetMapping or similar, the system should:

1. Detect the absence of a version in the request mapping.
2. Fall back to the defaultVersion property configured in ApiVersionConfigurer.
3. Include that default version in the OpenAPI schema.
   Example of desired outcome:
   If ApiVersionConfigurer sets defaultVersion = "1", then:
   @RequestMapping(value = "/api/v{version}", produces = APPLICATION_JSON_VALUE)
   @GetMapping("/data") → should generate OpenAPI path: /api/v1/data
   The OpenAPI doc should reflect v1 as the version for this endpoint.