Failed to process bulk – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to process a bulk request due to reasons like insufficient memory, incorrect data format, or a timeout. To resolve this, you can increase the heap size to provide more memory, ensure the data format is correct, or increase the timeout limit. Also, consider breaking down the bulk request into smaller parts to reduce the load on the server.

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

Log Context

Log “failed to process bulk” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             logger.warn("failed to execute bulk: [{}]"; e.getMessage());
            } catch (Exception e) {
                logger.warn("failed to process bulk"; e);
            bulkRequest = new BulkRequest();
        return bulkRequest;


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