PropName on mapper – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-7.15

Briefly, this error occurs when there’s an attempt to modify an existing field or add a new field with the same name but different properties in Elasticsearch. This is not allowed as Elasticsearch requires consistency in field mappings. To resolve this, you can either delete and recreate the index with the new mapping, or create a new index with a different name and the desired mapping. If the data is important, reindex the data from the old index to the new one. Be sure to define mappings correctly before indexing data.

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 Elasticsearch concepts: index.

Log Context

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

 deprecationLogger.deprecate(DeprecationCategory.MAPPINGS; propName;
 "Parameter [{}] is deprecated and will be removed in a future version";
 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);