Tragic event in index writer – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 5-5

Briefly, this error occurs when there’s a critical issue with the Lucene Index Writer in Elasticsearch, often due to a disk hardware failure or a file system corruption. To resolve this issue, you can try the following: 1) Check the disk health and replace it if necessary. 2) Verify the file system integrity and fix any corruption. 3) If the index is not recoverable, consider deleting and recreating it from a backup. 4) Ensure Elasticsearch has sufficient disk space and proper permissions to write to the index directory.

This guide will help you check for common problems that cause the log ” tragic event in index writer ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “tragic event in index writer” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         // we need to fail the engine. it might have already been failed before
        // but we are double-checking it's failed and closed
        if (indexWriter.isOpen() == false && indexWriter.getTragicException() != null) {
            if (indexWriter.getTragicException() instanceof Error) {
                try {
                    logger.error("tragic event in index writer"; ex);
                } finally {
                    throw (Error) indexWriter.getTragicException();
            } else {
                failEngine("already closed by tragic event on the index writer"; (Exception) indexWriter.getTragicException());


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