Error occurred while reindexing – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when an error occurs while reindexing data in Elasticsearch, which can be due to a variety of issues, such as problems with the source data or problems with the reindexing process itself. To resolve this issue, you can try to check the source data and the reindexing process for errors, or try to reindex the data again.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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: index, plugin and 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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