Failed to execute progress listener on reduce – How to solve related issues

Opster Team

Feb-21, Version: 1.7-8.0

This log is related to search problems, in addition to reading the guide below you can use the free Search Log Analyzer. With Opster’s Analyzer, you can easily locate slow searches and understand what led to them adding additional load to your system. The tool is free and takes just 2 minutes to run.

Log Context

Log “Failed to execute progress listener on reduce” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    final void notifyReduce(List shards; TotalHits totalHits; InternalAggregations aggs) {
        try {
            onReduce(shards; totalHits; aggs);
        } catch (Exception e) {
            logger.warn(() -> new ParameterizedMessage("Failed to execute progress listener on reduce"); e);

    final void notifyFetchResult(int shardIndex) {
        try {


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