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To draw a comparison to other resources, when creating a crosswalk cluster, you can pass in an existing aws cluster. If it exists, it will get the cluster and use it, if it doesn't it creates a new cluster.  Looking at the source for the load balancer, it seems to always create one no matter what.

Cluster Implementation
<https://github.com/pulumi/pulumi-awsx/blob/6e41506897a3d7bf3985beb8ecdc596638047699/nodejs/awsx/ecs/cluster.ts#L49>

Load Balancer Implementation
<https://github.com/pulumi/pulumi-awsx/blob/6e41506897a3d7bf3985beb8ecdc596638047699/nodejs/awsx/lb/loadBalancer.ts#L42>