Failed to parse index file name – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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, discovery-file, index, repositories and repository-azure.

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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