Failed to parse index file name – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.3

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Briefly, this error occurs when Elasticsearch is unable to parse the name of an index file. This could be due to a malformed file name, a file name that contains special characters, or a file name that is too long. To resolve this issue, you can try renaming the index file with a simpler name, removing any special characters, or shortening the file name. Additionally, ensure that the file name adheres to the naming conventions of Elasticsearch. If the problem persists, consider reindexing your data.

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This guide will help you check for common problems that cause the log ” failed to parse index file name [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore, repositories, index.

Log Context

Log “failed to parse index file name [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        int gen = Integer.parseInt(name.substring(SNAPSHOT_INDEX_PREFIX.length()));
                        if (gen > latest) {
                            latest = gen;
                    } catch (NumberFormatException ex) {
                        logger.warn("failed to parse index file name [{}]"; name);
            if (latest >= 0) {
                try {


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