Failed to flush shard on translog threshold – How to solve related issues

Opster Team

Feb-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.

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This guide will help you check for common problems that cause the log ” Failed to flush shard on translog threshold ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: flush, index, shard and threshold.

Log Context

Log “failed to flush shard on translog threshold” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     logger.trace("ignoring EsRejectedExecutionException; shutting down"; t);

                public void onFailure(Throwable t) {
                    logger.warn("failed to flush shard on translog threshold"; t);

                protected void doRun() throws Exception {


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