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

Opster Team

Aug-23, Version: 6.8-7.3

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.

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