Graylog
Index read only
curl -XPUT -H 'Content-Type: application/json' http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'
Index read only
curl -XPUT -H 'Content-Type: application/json' http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'