Expected map for property fields on field fieldName but got a – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch expects a map data structure for the property [fields] on a specific field, but it receives a different data type. This usually happens due to incorrect data input or mapping. To resolve this issue, you can: 1) Check the data input or mapping for the field and ensure it’s a map type. 2) Validate your JSON input for any syntax errors. 3) If you’re using dynamic mapping, ensure the correct data type is being dynamically mapped.

This guide will help you check for common problems that cause the log ” Expected map for property [fields] on field [” + fieldName + “] but got a ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Expected map for property [fields] on field [” + fieldName + “] but got a ” class name is ObjectMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 MappingParser.checkNoRemainingFields(fieldName; propNode);
 } else if (isEmptyList) {
 } else {
 throw new MapperParsingException("Expected map for property [fields] on field [" + fieldName + "] but got a "
 + fieldName.getClass());
 }  MappingParser.checkNoRemainingFields(propsNode; "DocType mapping definition has unsupported parameters: ");


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