Unexpected error – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch 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 ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: recovery and indices.

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”classname  is PeerRecoveryTargetService.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public void onFailure(Exception e) {
 try (RecoveryRef recoveryRef = onGoingRecoveries.getRecovery(recoveryId)) {
 if (recoveryRef != null) {
 logger.error(() -> new ParameterizedMessage("unexpected error during recovery [{}]; failing shard"; recoveryId); e);
 onGoingRecoveries.failRecovery(recoveryId;
 new RecoveryFailedException(recoveryRef.target().state(); "unexpected error"; e);
 true // be safe
 );
 } else {
 logger.debug(() -> new ParameterizedMessage(
 "unexpected error during recovery; but recovery id [{}] is finished"; recoveryId); e);

 

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