Deleted primary term – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.6-2.9

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Briefly, this error occurs when there’s a conflict between the primary term of a shard and the cluster state. The primary term is a counter that increases each time a new primary shard is assigned. If a shard has a higher primary term than the cluster state, it’s deleted to prevent stale or duplicate data. To resolve this, you can try to manually increase the primary term of the cluster state, or restart the node to force a new primary shard assignment. Also, ensure your OpenSearch version is up-to-date as this could be a bug fixed in later versions.

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This guide will help you check for common problems that cause the log ” Deleted primary term {} ” 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 {}” 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 {}"; primaryTerm);

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


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