Unexpected error while replicating for action . shard . – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

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.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

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();
        }

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

        /**
         * start sending replica requests to target nodes



 

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