Finished segment upgrade – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch has completed the process of upgrading an index segment. This is not an error message but an informational message indicating that the segment upgrade process has been successfully completed. If you see this message, it means that your Elasticsearch has successfully upgraded an older index segment to a newer version. No action is needed as this is part of the normal operation of Elasticsearch. However, if you’re seeing this message frequently, it might indicate that your system is constantly upgrading segments, which could be a sign of an underlying issue.

This guide will help you check for common problems that cause the log ” finished segment upgrade ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, upgrade.

Log Context

Log “finished segment upgrade” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    // request and therefore don't expect any further writes so we may as well do the final refresh immediately and get it
                    // out of the way.
                if (upgrade) {
          "finished segment upgrade");
            } finally {
        } catch (AlreadyClosedException ex) {


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