为什么80%的码农都做不了架构师？>>> 
问题描述
今天发现当天的索引在ES中并没有创建，logstash中不停的报错：
[INFO ][logstash.outputs.elasticsearch] Retrying individual bulk actions that failed or were rejected by the previous bulk request. {:count=>1}
[INFO ][logstash.outputs.elasticsearch] retrying failed action with response code: 403 ({"type"=>"cluster_block_exception", "reason"=>"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"})
索引变成了只读：
index read-only / allow delete (api)];"}
es报错，es报错也是索引只读错误
[2018-08-23T17:30:35,546][WARN ][o.e.x.m.e.l.LocalExporter] unexpected error while indexing monitoring document
org.elasticsearch.xpack.monitoring.exporter.ExportException: ClusterBlockException[blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.lambda$throwExportException$2(LocalBulk.java:134) ~[?:?]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_144]
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_144]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[?:1.8.0_144]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[?:1.8.0_144]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_144]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_144]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_144]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_144]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_144]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.throwExportException(LocalBulk.java:135) ~[?:?]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.lambda$doFlush$0(LocalBulk.java:118) ~[?:?]
at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:59) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:85) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:81) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkRequestModifier.lambda$wrapActionListenerIfNeeded$0(TransportBulkAction.java:571) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:59) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkOperation$1.finishHim(TransportBulkAction.java:380) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkOperation$1.onFailure(TransportBulkAction.java:375) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction$1.onFailure(TransportAction.java:91) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.finishAsFailed(TransportReplicationAction.java:908) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.handleBlockException(TransportReplicationAction.java:826) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.handleBlockExceptions(TransportReplicationAction.java:814) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.doRun(TransportReplicationAction.java:712) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction.doExecute(TransportReplicationAction.java:169) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction.doExecute(TransportReplicationAction.java:97) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:167) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.xpack.security.action.filter.SecurityActionFilter.apply(SecurityActionFilter.java:125) ~[?:?]
at org.elasticsearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:165) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:139) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:81) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkOperation.doRun(TransportBulkAction.java:350) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction.executeBulk(TransportBulkAction.java:462) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction.doExecute(TransportBulkAction.java:175) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.bulk.TransportBulkAction.lambda$processBulkIndexIngestRequest$4(TransportBulkAction.java:514) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.ingest.PipelineExecutionService$2.doRun(PipelineExecutionService.java:98) [elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:638) [elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-6.0.0.jar:6.0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_144]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_144]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
Caused by: org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];
at org.elasticsearch.cluster.block.ClusterBlocks.indexBlockedException(ClusterBlocks.java:182) ~[elasticsearch-6.0.0.jar:6.0.0]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.handleBlockExceptions(TransportReplicationAction.java:812) ~[elasticsearch-6.0.0.jar:6.0.0]
... 20 more
解决办法
经过分析，发现是因为ES所在服务器磁盘空间太低引起，具体解决办法如下：
在kibana开发控制台执行下面语句即可：
PUT _settings
{
"index": {
"blocks": {
"read_only_allow_delete": "false"
}
}
}
原因
一旦在存储超过95％的磁盘中的节点上分配了一个或多个分片的任何索引，该索引将被强制进入只读模式
参考链接：https://www.aityp.com/%E8%A7%A3%E5%86%B3elasticsearch%E7%B4%A2%E5%BC%95%E5%8F%AA%E8%AF%BB/