OnPreFetchPhase 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 the pre-fetch phase of Elasticsearch fails. This could be due to a variety of reasons such as a bug in the code, a network issue, or a problem with the Elasticsearch cluster. To resolve this issue, you can try debugging the listener to identify the root cause, check the network connectivity, or inspect the health of the Elasticsearch cluster. If the problem persists, consider updating or reinstalling Elasticsearch, or reviewing the listener’s code for potential errors.

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

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



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