Index template for index patterns existing == null adding updating – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when there’s an attempt to add or update an index template for specific index patterns in OpenSearch. The error message indicates that the existing template is either being updated or a new one is being added. To resolve this, ensure that the index template being added or updated is correctly formatted and compatible with your OpenSearch version. Also, check for any conflicts with existing index templates. If updating, ensure the existing template is accessible and not locked or deleted.

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This guide will help you check for common problems that cause the log ” {} index template [{}] for index patterns {}”; existing == null ? “adding” : “updating ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, template, cluster, metadata.

Log Context

Log “{} index template [{}] for index patterns {}”; existing == null ? “adding” : “updating” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            throw new IllegalArgumentException("composable template [" + name +
                "] template after composition " +
                (finalIndexTemplate.composedOf().size() > 0 ? "with component templates " + finalIndexTemplate.composedOf() + " " : "") +
                "is invalid"; e);
        }"{} index template [{}] for index patterns {}"; existing == null ? "adding" : "updating"; name;
        return ClusterState.builder(currentState)
            .metadata(Metadata.builder(currentState.metadata()).put(name; finalIndexTemplate))


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