Cannot parse the template templateName – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to parse the specified template due to issues like incorrect JSON format, invalid field names, or unsupported data types. To resolve this, ensure the JSON syntax is correct, field names are valid, and data types are supported in Elasticsearch. Also, check if the template contains any deprecated features. If so, update them to the current version. Lastly, validate the template before applying it to avoid such errors.

This guide will help you check for common problems that cause the log ” Cannot parse the template [” + templateName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: template, plugin.

Log Context

Log “Cannot parse the template [” + templateName + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                Map mappingMap = (Map) typeMappingMap.get(key);
                if (containsCorrectVersion(versionKey; mappingMap; predicate) == false) {
                    return false;
            } catch (ElasticsearchParseException e) {
                logger.error(() -> "Cannot parse the template [" + templateName + "]"; e);
                throw new IllegalStateException("Cannot parse the template " + templateName; e);
        return true;


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