public boolean isPlaneDefined(ToShapeId service, ToShapeId operationOrResource) {
        return resolvePlane(service, operationOrResource.toShapeId()) != null;
    }
Checks if the given shape within a service has a resolvable plane.

@param service Service to check.
@param operationOrResource Operation or resource within the service to check.
@return Returns true if the shape has a resolvable plane.
smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/PlaneIndex.java