To do this for the current session, you can do this:

PUT _cluster/settings
{
    "transient": {
        "action.destructive_requires_name": false
    }
}

… after that I can do DELETE “…/dummy*”

… but I want to do it permanently, so I tried this:

{
    "permanent": {
        "action.destructive_requires_name": false
    }
}

… fails with status 400: “”reason”: “Validation Failed: 1: no settings to update;””.

Just to make sure, I tried set to true, with a view to setting to false afterwards. I got the same error with true.

Can anyone explain the failure and say whether it’s possible to set this permanently?