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Briefly, this error occurs when OpenSearch attempts to perform a synced flush operation but encounters an unexpected issue. This could be due to a variety of reasons such as network issues, disk space problems, or a node being unresponsive. To resolve this, you could try to manually flush the indices, check the health of your nodes, ensure there’s enough disk space, or look into network connectivity. If the problem persists, consider checking the OpenSearch logs for more detailed error information.
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This guide will help you check for common problems that cause the log ” {} unexpected error while executing synced flush ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, flush.
Log Context
Log “{} unexpected error while executing synced flush” classname is SyncedFlushService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
}
}
@Override
public void onFailure(Exception e) {
logger.debug("{} unexpected error while executing synced flush"; shardId);
final int totalShards = indexMetadata.getNumberOfReplicas() + 1;
results.get(index).add(new ShardsSyncedFlushResult(shardId; totalShards; e.getMessage()));
if (countDown.countDown()) {
listener.onResponse(new SyncedFlushResponse(results));
}
