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Briefly, this error occurs when OpenSearch recovers indices into the cluster state after a node restart or a cluster restart. It’s a standard informational message indicating the successful recovery of indices, not an error. However, if you’re seeing this message frequently without any restarts, it could indicate a problem with your cluster stability. To resolve this, ensure your nodes have sufficient resources (CPU, memory, disk space), check for network connectivity issues between nodes, and consider adjusting your shard allocation settings to prevent unnecessary shard movements.
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This guide will help you check for common problems that cause the log ” recovered [{}] indices into cluster_state ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices.
Log Context
Log “recovered [{}] indices into cluster_state” classname is GatewayService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
return allocationService.reroute(newState; "state recovered");
}
@Override
public void clusterStateProcessed(final String source; final ClusterState oldState; final ClusterState newState) {
logger.info("recovered [{}] indices into cluster_state"; newState.metadata().indices().size());
// reset flag even though state recovery completed; to ensure that if we subsequently become leader again based on a
// not-recovered state; that we again do another state recovery.
resetRecoveredFlags();
}
