一 read_only_allow_delete" : "true"
当我们在向某个索引添加一条数据的时候，可能（极少情况）会碰到下面的报错：
{"error": { "root_cause": [ { "type": "cluster_block_exception", "reason": "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];" } ], "type": "cluster_block_exception", "reason": "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"},"status": 403
}
上述报错是说索引现在的状态是只读模式（read-only），如果查看该索引此时的状态：
GET z1/_settings
# 结果如下
{"z1" : { "settings" : { "index" : { "number_of_shards" : "5", "blocks" : { "read_only_allow_delete" : "true" }, "provided_name" : "z1", "creation_date" : "1556204559161", "number_of_replicas" : "1", "uuid" : "3PEevS9xSm-r3tw54p0o9w", "version" : { "created" : "6050499" } } }}
}
可以看到"read_only_allow_delete" : "true"，说明此时无法插入数据，当然，我们也可以模拟出来这个错误：
PUT z1
{"mappings": { "doc": { "properties":
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002——GO两数相加)
