code: @Override
      public GetIntrospectionSchemaResult getIntrospectionSchema(GetIntrospectionSchemaRequest request) {
          request = beforeClientExecution(request);
          return executeGetIntrospectionSchema(request);
      }
docs: <p>
  Retrieves the introspection schema for a GraphQL API.
  </p>
  
  @param getIntrospectionSchemaRequest
  @return Result of the GetIntrospectionSchema operation returned by the service.
  @throws GraphQLSchemaException
  The GraphQL schema is not valid.
  @throws NotFoundException
  The resource specified in the request was not found. Check the resource, and then try again.
  @throws UnauthorizedException
  You are not authorized to perform this operation.
  @throws InternalFailureException
  An internal AWS AppSync error occurred. Try your request again.
  @sample AWSAppSync.GetIntrospectionSchema
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/appsync-2017-07-25/GetIntrospectionSchema" target="_top">AWS
  API Documentation</a>