Failed to convert default categorization analyzer to map – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.6-8.9

Briefly, this error occurs when Elasticsearch is unable to convert the default categorization analyzer into a map. This could be due to a misconfiguration or an unsupported analyzer. To resolve this issue, you can check the Elasticsearch configuration for any errors or inconsistencies. Ensure that the default categorization analyzer is correctly defined and supported. If the problem persists, consider using a different analyzer that is compatible with your Elasticsearch version.

This guide will help you check for common problems that cause the log ” failed to convert default categorization analyzer to map ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “failed to convert default categorization analyzer to map” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } catch (IOException e) {
            logger.error("failed to convert default categorization analyzer to map"; e);
        return defaults;

    private ByteSizeValue defaultModelMemoryLimit() {


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