Object mapper mapper fullPath is defined more than once – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.1-8.9

Briefly, this error occurs when an object mapper is defined multiple times in Elasticsearch. This usually happens when you’re trying to create an index with a mapping that has duplicate fields. To resolve this issue, you can either rename the duplicate fields or remove the redundant field definitions. Also, ensure that the mapping is correctly defined before creating the index. It’s important to validate your mapping to avoid such conflicts.

This guide will help you check for common problems that cause the log ” Object mapper [” + mapper.fullPath() + “] is defined more than once ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Object mapper [” + mapper.fullPath() + “] is defined more than once” class name is MappingLookup.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Map objects = new HashMap<>();  List nestedMappers = new ArrayList<>();
 for (ObjectMapper mapper : objectMappers) {
 if (objects.put(mapper.fullPath(); mapper) != null) {
 throw new MapperParsingException("Object mapper [" + mapper.fullPath() + "] is defined more than once");
 if (mapper.isNested()) {
 nestedMappers.add((NestedObjectMapper) mapper);


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