Set default index with curl command - Error from Elastic


I am using Elasticsearch 7.0.1 and I am trying to set an index as default with the below command:

curl 'ip_:5601/api/kibana/settings'
-H 'kbn-version: 7.0.1'
-H 'Content-Type: application/json'
--data-binary '{"changes":{"defaultIndex":"979390d0-3def-11ea-ad1f-5b09c073c7d3"}}'

and I get :
{"message":"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];: [cluster_block_exception] blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];","statusCode":403,"error":"Forbidden"}

I read this

but there is only :

I tried this :

but with no result.

Could you please help with this?
Thank you in advance!

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