Field name multiFieldName which is a multi field of name cannot – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when you try to define a multi-field with the same name as an existing field. Elasticsearch doesn’t allow this because it can cause confusion and data inconsistency. To resolve this issue, you can either rename the multi-field or the existing field to avoid the name conflict. Alternatively, you can restructure your data model to avoid the need for a multi-field with the same name.

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This guide will help you check for common problems that cause the log ” Field name [” + multiFieldName + “] which is a multi field of [” + name + “] cannot ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Field name [” + multiFieldName + “] which is a multi field of [” + name + “] cannot” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  for (Map.Entry multiFieldEntry : multiFieldsPropNodes.entrySet()) {
 String multiFieldName = multiFieldEntry.getKey();
 if (multiFieldName.contains(".")) {
 throw new MapperParsingException("Field name [" + multiFieldName + "] which is a multi field of [" + name + "] cannot" +
 " contain '.'");
 if ((multiFieldEntry.getValue() instanceof Map) == false) {
 throw new MapperParsingException("illegal field [" + multiFieldName + "]; only fields can be specified inside fields");


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