OnFailedFetchPhase listener listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an issue during the fetch phase of a search request, and the listener that handles failures also fails. This could be due to a variety of reasons such as network issues, node failures, or bugs in the code. To resolve this issue, you can try the following: 1) Check the health of your nodes and network, 2) Review your code for any potential bugs, 3) Update Elasticsearch to the latest version as it might be a known issue that has been fixed, and 4) Increase the logging level to get more detailed error messages.

This guide will help you check for common problems that cause the log ” onFailedFetchPhase 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 “onFailedFetchPhase listener [” + listener + “] failed” classname is SearchOperationListener.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        public void onFailedFetchPhase(SearchContext searchContext) {
            for (SearchOperationListener listener : listeners) {
                try {
                } catch (Exception e) {
                    logger.warn(() -> "onFailedFetchPhase listener [" + listener + "] failed"; e);



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