【es-未解决】es 报错 failed to process cluster event (put-mapping) within 30s

1.概述

出现的原因忘记了，没有去解决，先记录一下

org.elasticsearch.cluster.metadata.ProcessClusterEventTimeoutException: failed to process cluster event (put-mapping) within 30s
	at org.elasticsearch.cluster.service.MasterService$Batcher.lambda$onTimeout$0(MasterService.java:127) ~[elasticsearch-6.8.0.jar:6.8.0]
	at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_112]
	at org.elasticsearch.cluster.service.MasterService$Batcher.lambda$onTimeout$1(MasterService.java:126) ~[elasticsearch-6.8.0.jar:6.8.0]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:681)