PUT /_project_routing/aws-us-only
{
  "expression" : "_csp:aws AND _region:us*"
}

resp = client.perform_request(
    "PUT",
    "/_project_routing/aws-us-only",
    headers={"Content-Type": "application/json"},
    body={
        "expression": "_csp:aws AND _region:us*"
    },
)

const response = await client.project.createRouting({
  name: "aws-us-only",
  expressions: {
    expression: "_csp:aws AND _region:us*",
  },
});

response = client.project.create_routing(
  name: "aws-us-only",
  body: {
    "expression": "_csp:aws AND _region:us*"
  }
)

$resp = $client->project()->createRouting([
    "name" => "aws-us-only",
    "body" => [
        "expression" => "_csp:aws AND _region:us*",
    ],
]);

curl -X PUT -H "Authorization: ApiKey $ELASTIC_API_KEY" -H "Content-Type: application/json" -d '{"expression":"_csp:aws AND _region:us*"}' "$ELASTICSEARCH_URL/_project_routing/aws-us-only"

var response = await client.Project
    .CreateRoutingAsync(name: "aws-us-only", d1 => d1
        .Expressions(d2 => d2
            .Expression("_csp:aws AND _region:us*")
        )
    );

client.project().createRouting(c -> c
    .name("aws-us-only")
    .expressions(e -> e
        .expression("_csp:aws AND _region:us*")
    )
);