Corrupt file detected source merge but is set to – 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 ” 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.

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 “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);


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