Index blob is not valid x-content bytes – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.3

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch encounters an invalid blob while indexing data. This could be due to corrupted data, incorrect data format, or a bug in the Elasticsearch version you’re using. To resolve this issue, you can try the following: 1) Check and correct the data format; 2) Reindex the data; 3) Upgrade Elasticsearch to the latest stable version; 4) If the data is corrupted, restore it from a backup.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” [{}] index blob is not valid x-content [{} bytes] ” 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 “[{}] index blob is not valid x-content [{} bytes]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                // EMPTY is safe here because RepositoryData#fromXContent calls namedObject
                try (XContentParser parser = XContentHelper.createParser(NamedXContentRegistry.EMPTY;
                    LoggingDeprecationHandler.INSTANCE; out.bytes(); XContentType.JSON)) {
                    repositoryData = RepositoryData.snapshotsFromXContent(parser; indexGen);
                } catch (NotXContentException e) {
                    logger.warn("[{}] index blob is not valid x-content [{} bytes]"; snapshotsIndexBlobName; out.bytes().length());
                    throw e;

            // now load the incompatible snapshot ids; if they exist


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?