Unexpected error cleaning up upload uploadId of blobKey – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to clean up an upload, identified by its uploadId, of a blobKey. This could be due to a variety of reasons such as insufficient permissions, network issues, or a corrupted blob. To resolve this issue, you can try the following: 1) Check and ensure that Elasticsearch has the necessary permissions to perform the cleanup. 2) Verify your network connectivity. 3) Try to identify and repair the corrupted blob, or delete and re-upload it if necessary.

This guide will help you check for common problems that cause the log ” unexpected error cleaning up upload [” + uploadId + “] of [” + blobKey + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repository-s3, repositories.

Log Context

Log “unexpected error cleaning up upload [” + uploadId + “] of [” + blobKey + “]” classname is S3BlobContainer.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (isComplete.compareAndSet(false; true)) {
                    try {
                    } catch (Exception e) {
                        // cleanup is a best-effort thing; we can't do anything better than log and fall through here
                        logger.error("unexpected error cleaning up upload [" + uploadId + "] of [" + blobKey + "]"; e);
                        assert false : e;


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