How to troubleshoot the following?
Caused by: org.elasticsearch.action.UnavailableShardsException: [.monitoring-es-7-2021.09.17][0] primary shard is not active Timeout: [1m], request: [BulkShardRequest [[.monitoring-es-7-2021.09.17][0]] containing [463] requests]
... 11 more
[2021-09-17T22:24:34,315][WARN ][o.e.x.m.e.l.LocalExporter] [node-2] unexpected error while indexing monitoring document
org.elasticsearch.xpack.monitoring.exporter.ExportException: UnavailableShardsException[[.monitoring-es-7-2021.09.17][0] primary shard is not active Timeout: [1m], request: [BulkShardRequest [[.monitoring-es-7-2021.09.17][0]] containing [463] requests]]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.lambda$throwExportException$2(LocalBulk.java:126) ~[x-pack-monitoring-7.14.1.jar:7.14.1]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.throwExportException(LocalBulk.java:127) [x-pack-monitoring-7.14.1.jar:7.14.1]
at org.elasticsearch.xpack.monitoring.exporter.local.LocalBulk.lambda$doFlush$0(LocalBulk.java:109) [x-pack-monitoring-7.14.1.jar:7.14.1]
at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:134) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:83) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:77) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.xpack.security.action.filter.SecurityActionFilter.lambda$applyInternal$2(SecurityActionFilter.java:163) [x-pack-security-7.14.1.jar:7.14.1]
at org.elasticsearch.action.ActionListener$DelegatingFailureActionListener.onResponse(ActionListener.java:217) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.ActionListener$RunBeforeActionListener.onResponse(ActionListener.java:387) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.ActionListener$MappedActionListener.onResponse(ActionListener.java:101) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkOperation$1.finishHim(TransportBulkAction.java:538) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.bulk.TransportBulkAction$BulkOperation$1.onFailure(TransportBulkAction.java:533) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.TransportAction$1.onFailure(TransportAction.java:92) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.ContextPreservingActionListener.onFailure(ContextPreservingActionListener.java:38) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.ActionListener$Delegating.onFailure(ActionListener.java:66) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.finishAsFailed(TransportReplicationAction.java:854) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.retry(TransportReplicationAction.java:826) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.retryBecauseUnavailable(TransportReplicationAction.java:885) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.doRun(TransportReplicationAction.java:735) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase$2.onTimeout(TransportReplicationAction.java:845) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.cluster.ClusterStateObserver$ContextPreservingListener.onTimeout(ClusterStateObserver.java:324) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.cluster.ClusterStateObserver$ObserverClusterStateListener.onTimeout(ClusterStateObserver.java:241) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.cluster.service.ClusterApplierService$NotifyTimeout.run(ClusterApplierService.java:590) [elasticsearch-7.14.1.jar:7.14.1]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:673) [elasticsearch-7.14.1.jar:7.14.1]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) [?:?]
at java.lang.Thread.run(Thread.java:831) [?:?]