Error parsing field name with unknown parameter fieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.7

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Briefly, this error occurs when Elasticsearch encounters a field with an unknown parameter during parsing. This could be due to a typo, incorrect syntax, or use of a parameter that doesn’t exist. To resolve this issue, you should first verify the field name and parameters used in your query or mapping. Ensure that they are correctly spelled and formatted. If the problem persists, check the Elasticsearch documentation to confirm if the parameter you’re using is valid. If it’s not, replace it with a valid one.

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This guide will help you check for common problems that cause the log ” error parsing field [” + name() + “]; with unknown parameter [” + fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “error parsing field [” + name() + “]; with unknown parameter [” + fieldName + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ensureExpectedToken(XContentParser.Token.VALUE_NUMBER; token; subParser);
 token = subParser.nextToken();
 } else {
 throw new MapperParsingException("error parsing field [" + name() + "]; with unknown parameter [" + fieldName + "]");
 token = subParser.nextToken();
 if (values == null) {
 throw new MapperParsingException(


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