OnFreeContext listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when a listener in Elasticsearch, specifically the OnFreeContext listener, encounters an issue during its operation. This could be due to a variety of reasons such as a bug in the code, a problem with the data, or a system resource issue. To resolve this issue, you could try debugging the code to identify any potential bugs, check the data for any inconsistencies or errors, or monitor the system resources to ensure they are not being overutilized. Additionally, ensure that your Elasticsearch version is up-to-date as this could also be a factor.

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 “onFreeContext listener [{}] failed” classname is SearchOperationListener.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        public void onFreeReaderContext(ReaderContext readerContext) {
            for (SearchOperationListener listener : listeners) {
                try {
                } catch (Exception e) {
                    logger.warn(() -> new ParameterizedMessage("onFreeContext listener [{}] failed"; listener); e);