How to suppress requestBody generation in OpenAPI spec using swagger-maven-plugin

I'm using the swagger-maven-plugin in a Java application with an old school servlet implementation. I'm trying to follow the examples here: https://github.com/swagger-api/swagger-samples/, but unfortunately this one: https://github.com/swagger-api/swagger-samples/blob/master/java/java-servlet/src/main/java/io/swagger/sample/servlet/SampleServlet.java which is the closest match, uses the 1.x version of swagger.core, not 2.x.

I found other examples that sort of work (see what I did below), except that it generates an almost 950 line requestBody element in the openapi.yaml doc for this endpoint. Why does it do that? Is there a way to suppress that? Below is the maven import and the code snippet:

<groupId>io.swagger.core.v3</groupId>
<artifactId>swagger-maven-plugin</artifactId>
<version>2.1.2</version>

The code with annotations is:

 @Path("/Test00020")

 public class Test00020 extends HttpServlet {

         @Override

         @GET

         @Operation (

                 summary = "Ask something, get something back.",

                 parameters = { @Parameter(in = ParameterIn.QUERY, name="TestParam00020", required = true ) }

         )

         public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ...

Thanks, Dave