ES只读模式修改
# ElasticSearch6 报错FORBIDDEN12index read-only allow delete (api)
FORBIDDEN/12/index read-only / allow delete (api)
官方解决方法：
curl -XPUT -H "Content-Type: application/json" http://127.0.0.1:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'
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_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}'
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实践成功方案：
curl -XPUT -H "Content-Type: application/json" http://192.168.0.23:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": "false"}'
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