Engine failed but can t find index shard failure reason – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch engine fails to locate the reason for an index shard failure. This could be due to a variety of reasons such as hardware failure, network issues, or insufficient disk space. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed error messages. 2) Ensure that there is enough disk space available. 3) Check the health of your network and hardware. 4) Consider increasing the number of replicas for your index to prevent data loss in case of shard failure.

This guide will help you check for common problems that cause the log ” [{}][{}] engine failed; but can’t find index shard. failure reason: [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster and indices.

Log Context

Log “[{}][{}] engine failed; but can’t find index shard. failure reason: [{}]” classname is IndicesClusterStateService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 if (indexShard != null) {
                    shardRouting = indexShard.routingEntry();
                }
            }
            if (shardRouting == null) {
                logger.warn("[{}][{}] engine failed; but can't find index shard. failure reason: [{}]"; failure;
                        shardId.index().name(); shardId.id(); reason);
                return;
            }
            final ShardRouting fShardRouting = shardRouting;
            threadPool.generic().execute(new Runnable() {




 

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