Field mapper name is defined both as an object and a field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.1-8.9

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Briefly, this error occurs when a field in Elasticsearch is defined as both an object and a field. This is not allowed as it creates ambiguity in the data structure. To resolve this issue, you can either rename one of the fields or change the data structure. For instance, if you have a field defined as an object and also as a keyword, you need to ensure that it is defined only once and in a consistent manner. Also, ensure that your mappings are correctly defined to avoid such conflicts.

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This guide will help you check for common problems that cause the log ” Field [” + + “] is defined both as an object and a field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Field [” + + “] is defined both as an object and a field” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final Map indexAnalyzersMap = new HashMap<>();
 final Set completionFields = new HashSet<>();
 final List indexTimeScriptMappers = new ArrayList<>();
 for (FieldMapper mapper : mappers) {
 if (objects.containsKey( {
 throw new MapperParsingException("Field [" + + "] is defined both as an object and a field");
 if (fieldMappers.put(; mapper) != null) {
 throw new MapperParsingException("Field [" + + "] is defined more than once");


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