今天在测试环境执行MySQL数据同步到ElasticSearch中时，出现无法写入的问题，并且提示
[FORBIDDEN/12/index read-only / allow delete (api)
排查后发现是ES所在服务器磁盘空间不足，导致索引无法写入，解决方式:
1.扩大磁盘或者删除部分历史索引
2.重置修改只读索引块
在Kibana上修改，如下
某一个索引重置只读模块 PUT /twitter/_settings { "index.blocks.read_only_allow_delete": null } 所有索引重置只读模块 PUT /_all/_settings { "index.blocks.read_only_allow_delete": null }
PUT /_cluster/settings { "persistent" : { "cluster.blocks.read_only" : false } }
修改默认配置
可以修改为具体的磁盘空间值，也可以修改为百分之多少 临时修改 PUT _cluster/settings { "transient": { "cluster.routing.allocation.disk.watermark.low": "100gb", "cluster.routing.allocation.disk.watermark.high": "50gb", "cluster.routing.allocation.disk.watermark.flood_stage": "10gb", "cluster.info.update.interval": "1m" } } 永久修改 PUT _cluster/settings { "persistent": { "cluster.routing.allocation.disk.watermark.low": "100gb", "cluster.routing.allocation.disk.watermark.high": "50gb", "cluster.routing.allocation.disk.watermark.flood_stage": "10gb", "cluster.info.update.interval": "1m" } }
参考文档：
https://www.elastic.co/guide/en/elasticsearch/reference/6.8/disk-allocator.html
【ElasticSearch】index read-only
原文：https://www.cnblogs.com/july-sunny/p/15121440.html