PropName on mapper – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when there’s a conflict in the mapping of the ‘PropName’ field in OpenSearch. This could be due to different data types being assigned to the same field in different documents. To resolve this, ensure that all documents use the same data type for the ‘PropName’ field. Alternatively, you can use the ‘ignore_malformed’ option to ignore documents with incorrect data types. Lastly, you can reindex your data with a new, correct mapping.

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This guide will help you check for common problems that cause the log ” [” + propName + “] on mapper [ ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “[” + propName + “] on mapper [” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 "Parameter [boost] on field [{}] is deprecated and will be removed in 8.0";
 if (propNode == null && parameter.acceptsNull == false) {
 throw new MapperParsingException("[" + propName + "] on mapper [" + name
 + "] of type [" + type + "] must not have a [null] value");
 parameter.parse(name; parserContext; propNode);


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