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The reason for the occurrence has been forgotten, and it has not been solved, please record it first
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)