Unknown synced flush result result – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an unexpected result during a synced flush operation. This could be due to a variety of reasons such as network issues, node failures, or data inconsistencies. To resolve this issue, you can try the following: 1) Check the health of your nodes and network, 2) Ensure that your data is consistent across all nodes, 3) Retry the synced flush operation, and 4) If the error persists, consider restarting your Elasticsearch cluster.

This guide will help you check for common problems that cause the log ” unknown synced flush result [” + result + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, flush.

Log Context

Log “unknown synced flush result [” + result + “]” class name is SyncedFlushService.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return new ShardSyncedFlushResponse("commit has changed");
 return new ShardSyncedFlushResponse("pending operations");
 throw new ElasticsearchException("unknown synced flush result [" + result + "]");
 }  private InFlightOpsResponse performInFlightOps(InFlightOpsRequest request) {
 IndexService indexService = indicesService.indexServiceSafe(request.shardId().getIndex());


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