Encountered bulk failures during reindex process – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.5-8.9

Briefly, this error occurs when Elasticsearch encounters issues during the reindexing process. This could be due to insufficient memory, incorrect mappings, or document conflicts. To resolve this, you can increase the heap size to provide more memory, ensure that the mappings are correct before reindexing, or handle document conflicts by using the correct versioning strategy. Additionally, check for any network connectivity issues or disk space constraints that might be causing the bulk failures.

This guide will help you check for common problems that cause the log ” Encountered bulk failures during reindex process ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, bulk, reindex.

Log Context

Log “Encountered bulk failures during reindex process” class name is EnrichPolicyRunner.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 delegate.onFailure(new ElasticsearchException("Encountered bulk failures during reindex process"));
 } else if (bulkByScrollResponse.getSearchFailures().size() > 0) {
 "Policy [{}]: encountered [{}] search failures. Turn on DEBUG logging for details.";