Error occurred while upgrading index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch encounters an issue during the process of upgrading an index. This could be due to a variety of reasons such as insufficient disk space, incompatible index version, or a network interruption. To resolve this issue, you can try freeing up disk space, ensuring the index version is compatible with the current Elasticsearch version, or checking the network connection. Additionally, checking the Elasticsearch logs can provide more specific details about the error, which can help in troubleshooting.

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

Log Context

Log “error occurred while upgrading index” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                            logger.error("error occurred while reindexing"; e);
                            removeReadOnlyBlockOnReindexFailure(parentAwareClient; index; listener; e);
                        })); listener::onFailure));
            }; listener::onFailure));
        } catch (Exception ex) {
            logger.error("error occurred while upgrading index"; ex);
            removeReadOnlyBlockOnReindexFailure(parentAwareClient; index; listener; ex);


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