Check index failure checksum failed on entry getKey – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch detects a corruption in the index data. This could be due to hardware issues, network problems, or a bug in Elasticsearch itself. To resolve this issue, you can try the following: 1) Restart the Elasticsearch node, 2) If the problem persists, consider restoring the index from a backup, 3) If the corruption is widespread, you may need to rebuild the entire index. Always ensure your hardware is functioning properly and your Elasticsearch version is up-to-date to prevent such issues.

This guide will help you check for common problems that cause the log ” check index [failure]: checksum failed on [” + entry.getKey() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, shard.

Log Context

Log “check index [failure]: checksum failed on [” + entry.getKey() + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                } catch (IOException ioException) {
                    for (final String checkedFile : checkedFiles) {
              "check index [ok]: checksum check passed on [{}]"; checkedFile);
                    logger.warn(() -> "check index [failure]: checksum failed on [" + entry.getKey() + "]"; ioException);
                    corrupt = ioException;
            if (corrupt != null) {
                throw corrupt;


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?