Prepare target for translog failed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while preparing the target for the transaction log (translog). This could be due to insufficient disk space, file system corruption, or a network connectivity issue. To resolve this, you can try freeing up disk space, checking the file system for errors, or troubleshooting network connectivity. Additionally, ensure that the Elasticsearch version is up-to-date and compatible with your system. If the issue persists, consider reindexing your data or restoring from a backup.

This guide will help you check for common problems that cause the log ” prepare target for translog failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: recovery, indices.

Log Context

Log “prepare target for translog failed” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final ActionListener wrappedListener = ActionListener.wrap(nullVal -> {
 final TimeValue tookTime = stopWatch.totalTime();
 logger.trace("recovery [phase1]: remote engine start took [{}]"; tookTime);
 }; e -> listener.onFailure(new RecoveryEngineException(shard.shardId(); 1; "prepare target for translog failed"; e)));
 // Send a request preparing the new shard's translog to receive operations. This ensures the shard engine is started and disables
 // garbage collection (not the JVM's GC!) of tombstone deletes.
 logger.trace("recovery [phase1]: prepare remote engine for translog");
 recoveryTarget.prepareForTranslogOperations(totalTranslogOps; wrappedListener);


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