Index Event Listener is called – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.7

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Briefly, this error occurs when an event listener is triggered for an index operation in OpenSearch, but encounters an issue. This could be due to a variety of reasons such as a misconfiguration, a network issue, or a bug in the code. To resolve this, you could check the configuration of your event listeners, ensure your network connectivity is stable, and debug your code to identify any potential issues. Additionally, ensure that your OpenSearch cluster has sufficient resources to handle the operations.

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This guide will help you check for common problems that cause the log ” Index Event Listener is called ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Index Event Listener is called” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                        public void beforeIndexRemoved(
                            IndexService indexService;
                            IndicesClusterStateService.AllocatedIndices.IndexRemovalReason reason
                        ) {
                  "Index Event Listener is called");
                            String indexName = indexService.index().getName();
                  "Index Name" + indexName.toString());
                            try {
                      "Sending extension request type: " + INDICES_EXTENSION_NAME_ACTION_NAME);


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