[Elasticsearch] es alias writable index can be written stupidly

1 Overview

Read this blog, first make a clear sentence

索引可写是索引可写
别名可写是别名可写
两者不是一回事
配置不通

索引可写 是 index.blocks.write=false,index.blocks.read_only=false
别名可写 是 is_write_index=true

1. bloks.read_only:true Set the current index to only allow reading, writing or updating, and deletion
2. blocks.read:true set to read the current index
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