Updating max merge docs from to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

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Briefly, this error occurs when Elasticsearch tries to update the maximum number of documents that can be merged at once, but the new value is not specified or is invalid. This could be due to a configuration error or a bug in the software. To resolve this issue, you can check your Elasticsearch configuration for any errors related to the ‘max_merge_docs’ setting. Ensure that the value is a positive integer. If the problem persists, consider updating or reinstalling Elasticsearch to fix any potential software bugs.

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This guide will help you check for common problems that cause the log ” updating max_merge_docs from [{}] to [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index and merge.

Log Context

Log “updating max_merge_docs from [{}] to [{}]” classname is LogDocMergePolicyProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


            int oldMaxMergeDocs = mergePolicy.getMaxMergeDocs();
            int maxMergeDocs = settings.getAsInt(INDEX_MERGE_POLICY_MAX_MERGE_DOCS; oldMaxMergeDocs);
            if (maxMergeDocs != oldMaxMergeDocs) {
                logger.info("updating max_merge_docs from [{}] to [{}]"; oldMaxMergeDocs; maxMergeDocs);

            int oldMergeFactor = mergePolicy.getMergeFactor();
            int mergeFactor = settings.getAsInt(INDEX_MERGE_POLICY_MERGE_FACTOR; oldMergeFactor);


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