Error occurred while reindexing – 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 reindexing process. This could be due to insufficient memory, incorrect mappings, or a network issue. To resolve this, you can increase the heap size or memory of your Elasticsearch cluster, ensure that the mappings are correct before reindexing, or check your network connectivity. Additionally, check the Elasticsearch logs for more specific error messages that can help identify the root cause.

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

Log Context

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

                                                        deleteIndexResponse -> listener.onResponse(bulkByScrollResponse);
                        }; e -> {
                            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);


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