Failed to read index file – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.4

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Briefly, this error occurs when Elasticsearch is unable to read the index file due to issues like file corruption, insufficient permissions, or disk space issues. To resolve this, you can try restoring the index from a backup, checking and correcting file permissions, or freeing up disk space. If the index file is corrupted, you may need to delete and recreate the index. Always ensure to have a backup strategy to prevent data loss.

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

Log Context

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

                final BlobStoreIndexShardSnapshots shardSnapshots =
          ; Long.toString(latest));
                return new Tuple(shardSnapshots; latest);
            } catch (IOException e) {
                final String file = SNAPSHOT_INDEX_PREFIX + latest;
                logger.warn(() -> new ParameterizedMessage("failed to read index file [{}]"; file); e);
        } else if (blobKeys.isEmpty() == false) {
            logger.warn("Could not find a readable index-N file in a non-empty shard snapshot directory [{}]"; shardContainer.path());
        return new Tuple(BlobStoreIndexShardSnapshots.EMPTY; latest);


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