PostIndexUnderLock listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch encounters an issue while executing a PostIndexUnderLock listener, which is a callback function that runs after an index operation is completed under lock. This could be due to a variety of reasons such as a bug in the listener code, a network issue, or a resource constraint. To resolve this issue, you could try debugging the listener code to identify any potential issues, check the network connectivity, or ensure that there are sufficient resources available for Elasticsearch to operate efficiently.

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

Log Context

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

     public void postIndexUnderLock(Engine.Index index) {
        for (IndexingOperationListener listener : listeners) {
            try {
            } catch (Exception e) {
                logger.warn("postIndexUnderLock listener [{}] failed"; e; listener);

    public void postIndex(Engine.Index index) {


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