public Builder operation(ShapeId operation) {
            this.operation = operation;
            return this;
        }
Set the operation used to discover endpoints for the service.

<p>The operation MUST be bound to the service.</p>

@param operation The ShapeId of the operation used to discover endpoints.
@return Returns the builder.
smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/clientendpointdiscovery/ClientEndpointDiscoveryTrait.java