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can you share your code? some properties in RDS are immutable, ie they can only be changed by a replace

```import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

const _default = new aws.rds.Cluster("cluster-at", {
    clusterIdentifier: "cluster-test", // --&gt; I want to change identifier
    availabilityZones: [
        "us-west-2a",
    ],
    databaseName: "foo",
    masterUsername: "bar",
    masterPassword: "*******",
});
const clusterInstances: aws.rds.ClusterInstance[];
for (const range = {value: 0}; range.value &lt; 2; range.value++) {
    clusterInstances.push(new aws.rds.ClusterInstance(`clusterInstances-${range.value}`, {
        identifier: `aurora-cluster-test-${range.value}`,
        clusterIdentifier: _default.id,
        instanceClass: "db.r4.medium",
        engine: _default.engine,
        engineVersion: _default.engineVersion,
    }));
}```

I want to change identifier and instance class in cluster instances

you cannot change the name/identifier of a resource without creating a new resource, this is a limitation of the AWS API

Ok! I tried only change instance class and it worked!! thank you <@UCWG26BH7>