_all 可以改为自己的索引名称，也可以直接执行
curl -XPUT -H "Content-Type: application/json" http://127.0.0.1:9200/_all/_settings -d ‘{"index.blocks.read_only_allow_delete": null}‘
FORBIDDEN/12/index read-only / allow delete (api)]
原文：https://www.cnblogs.com/lfl17718347843/p/13362508.html