The encrypted blob blobName is too small bytesRead – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.12-8.6

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Briefly, this error occurs when the encrypted blob (a type of data file) in Elasticsearch is smaller than expected. This could be due to corruption or incomplete data transfer. To resolve this issue, you can try re-indexing the data, ensuring that the data transfer is complete, or checking for any corruption in the data file. If the problem persists, consider checking your encryption settings or the compatibility of your data with Elasticsearch.

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This guide will help you check for common problems that cause the log ” The encrypted blob [” + blobName + “] is too small [” + bytesRead + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, plugin.

Log Context

Log “The encrypted blob [” + blobName + “] is too small [” + bytesRead + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 // read the DEK Id (fixed length) which is prepended to the encrypted blob
 final byte[] dekIdBytes = new byte[DEK_ID_LENGTH];
 final int bytesRead = Streams.readFully(encryptedDataInputStream; dekIdBytes);
 if (bytesRead != DEK_ID_LENGTH) {
 throw new RepositoryException(repositoryName; "The encrypted blob [" + blobName + "] is too small [" + bytesRead + "]");
 final String dekId = new String(dekIdBytes; StandardCharsets.UTF_8);
 // might open a connection to read and decrypt the DEK; but most likely it will be served from cache
 final SecretKey dek = getDEKById.apply(dekId);
 // read and decrypt the rest of the blob


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