Received ack response from Extension – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.5

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Briefly, this error occurs when OpenSearch receives an acknowledgment response from an extension. This is not necessarily an error, but more of an informational message indicating that a certain operation or request has been successfully received by the extension. If you’re experiencing issues, it might be unrelated to this message. However, if you suspect it’s causing problems, you can troubleshoot by checking the extension’s configuration, ensuring it’s compatible with your OpenSearch version, or disabling the extension temporarily to see if the issue persists.

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This guide will help you check for common problems that cause the log ” Received ack response from Extension ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: response.

Log Context

Log “Received ack response from Extension” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                                    new IndicesModuleRequest(indexModule);
                                // TODO: make asynchronous
                                inProgressIndexNameFuture.get(EXTENSION_REQUEST_WAIT_TIMEOUT; TimeUnit.SECONDS);
                      "Received ack response from Extension");
                            } catch (Exception e) {
                                try {
                                    throw e;
                                } catch (Exception e1) {


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