Corrupt file detected source merge but is set to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch detects a corrupted file during a merge operation. This could be due to hardware issues, file system problems, or a bug in Elasticsearch. To resolve this issue, you can try the following: 1) Restart the Elasticsearch node, 2) Check the hardware for any issues, 3) Check the file system for any corruption, 4) Upgrade Elasticsearch to the latest version to fix any potential bugs, 5) If the problem persists, consider reindexing your data.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” corrupt file detected source: [merge] but [{}] is set to [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery-file and index.

Log Context

Log “corrupt file detected source: [merge] but [{}] is set to [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         public void onFailedMerge(MergePolicy.MergeException e) {
            if (Lucene.isCorruptionException(e)) {
                if (engineConfig.isFailEngineOnCorruption()) {
                    failEngine("corrupt file detected source: [merge]"; e);
                } else {
                    logger.warn("corrupt file detected source: [merge] but [{}] is set to [{}]"; e; EngineConfig.INDEX_FAIL_ON_CORRUPTION_SETTING; engineConfig.isFailEngineOnCorruption());
            } else if (engineConfig.isFailOnMergeFailure()) {
                failEngine("merge exception"; e);


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?