[standalone@localhost:9990 /] /subsystem=elytron/dir-context=dc:write-attribute(name=url, value=ldap://localhost:10389)
{
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0048: Attribute url is not writable",
    "rolled-back" => true
}

"url" => {
    "type" => STRING,
    "description" => "The connection url.",
    "expressions-allowed" => true,
    "nillable" => true,
    "min-length" => 1L,
    "max-length" => 2147483647L,
    "access-type" => "read-only",
    "storage" => "configuration"
}