Deleted primary term for – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.8-2.8

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Briefly, this error occurs when the primary term of a shard in OpenSearch is deleted. The primary term is a counter that increases each time a primary shard is promoted to avoid stale or out-of-order updates. This error could be due to a bug, network partition, or other issues. To resolve this, you can try restarting the node, reindexing the data, or increasing the primary term manually. If the issue persists, consider checking your cluster’s health and ensure that there are no underlying network or hardware issues.

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This guide will help you check for common problems that cause the log ” Deleted primary term {} for {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Deleted primary term {} for {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            new ActionListener() {
                public void onResponse(Void unused) {
          "Deleted primary term {} for {}"; primaryTerm; shardId);

                public void onFailure(Exception e) {
                    logger.error(new ParameterizedMessage("Exception occurred while deleting primary term {}"; primaryTerm); e);


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