Cannot parse the template – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.16-8.2

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Briefly, this error occurs when Elasticsearch is unable to parse the index template due to incorrect syntax, invalid JSON format, or unsupported fields. To resolve this issue, you can validate your JSON format using a JSON validator. Ensure that the syntax is correct and all necessary fields are included. Also, check if the template is compatible with your Elasticsearch version. If the error persists, consider simplifying your template or breaking it down into smaller parts to isolate the problematic section.

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This guide will help you check for common problems that cause the log ” Cannot parse the template [{}] ” 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 [{}]” 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(new ParameterizedMessage("Cannot parse the template [{}]"; templateName); e);
                throw new IllegalStateException("Cannot parse the template " + templateName; e);
        return true;


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