问题出现：
ES集群中一台机器硬盘损坏，换上新的硬盘后，数据分片同步，Spark入ES的程序启动失败，ES是3副本存储的
Spark：2.2.0-cdh5.12.0
ES：6.3.2
错误日志：
INFO scheduler.TaskSetManager: Lost task 8.1 in stage 1.0 (TID 26) on bigdata-247, executor 3: org.elasticsearch.hadoop.EsHadoopException (Could not write all entries for bulk operation [1000/1000]. Error sample (first [5] error messages):
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
Bailing out...) [duplicate 9]
原因：
只是由于数据同步后，ES集群为了保护数据，会自动把索引分片index置为只读read-only
解决办法：
curl -XPUT -H "Content-Type: application/json" http://ip:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'
返回：
{"acknowledged":true}
其中 _all 这个可以更改为自己在创建 Eleastisearch 索引的时候的name，用来修改单个索引只读状态，当然用 _all 也可以, _all 是修改了所有的索引只读状态ES解除索引只读限制