OnFreeContext listener listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when a listener in Elasticsearch fails during the execution of the OnFreeContext event. This could be due to a variety of reasons such as a bug in the code, a network issue, or a resource constraint. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed error information. 2) Review the code for any potential bugs or issues. 3) Check the system resources to ensure there are no constraints. 4) If the issue persists, consider upgrading Elasticsearch to the latest version as it may contain a fix for this issue.

This guide will help you check for common problems that cause the log ” onFreeContext listener [” + listener + “] failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, shard.

Log Context

Log “onFreeContext listener [” + 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(() -> "onFreeContext listener [" + listener + "] failed"; e);