Unexpected error while replicating for action shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

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Briefly, this error occurs when Elasticsearch encounters an issue while trying to replicate data for shard action. This could be due to network issues, insufficient disk space, or a problem with the underlying hardware. To resolve this, you can check the network connectivity between the nodes, ensure there is enough disk space, and verify the health of the hardware. Additionally, check the Elasticsearch logs for more detailed error information. If the issue persists, consider reindexing the data or increasing the number of replicas.

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This guide will help you check for common problems that cause the log ” unexpected error while replicating for action [{}]. shard [{}]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: replication.

Log Context

Log “unexpected error while replicating for action [{}]. shard [{}].” classname is TransportReplicationAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             return pending.get();

        public void onFailure(Throwable t) {
            logger.error("unexpected error while replicating for action [{}]. shard [{}]. "; t; actionName; shardId);

         * start sending replica requests to target nodes


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