Cannot parse the mapping for index indexName – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to understand the mapping provided for a specific index. This could be due to incorrect syntax, incompatible data types, or invalid field names in the mapping. To resolve this issue, you can: 1) Review the mapping syntax and ensure it follows the correct format. 2) Check the data types of your fields and ensure they match with the ones specified in the mapping. 3) Validate the field names and ensure they don’t contain any illegal characters or start with an underscore.

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

Log Context

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

                // If we called `Version.fromString(null)`; it would return `Version.CURRENT` and we wouldn't update the mappings
                return Version.V_EMPTY;
            return Version.fromString(versionString);
        } catch (ElasticsearchParseException | IllegalArgumentException e) {
            logger.error(() -> "Cannot parse the mapping for index [" + indexName + "]"; e);
            return Version.V_EMPTY;

    static class State {


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