public Builder connectionId(String connectionId) {
            this.connectionId = connectionId;
            return this;
        }
Sets the ID of a VpcLink when using a private integration.

@param connectionId VPC link ID.
@return Returns the builder.
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/IntegrationTrait.java