Field currentFieldName is a metadata field and cannot be added inside – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.9

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Briefly, this error occurs when you try to add a metadata field inside a document in Elasticsearch. Metadata fields are system fields that hold information about the document itself, like “_index”, “_type”, “_id”, etc. They cannot be added or modified directly. To resolve this issue, you should avoid using metadata field names for your custom fields. If you need to store similar information, use a different field name that doesn’t conflict with the reserved metadata field names.

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This guide will help you check for common problems that cause the log ” Field [” + currentFieldName + “] is a metadata field and cannot be added inside ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, metadata.

Log Context

Log “Field [” + currentFieldName + “] is a metadata field and cannot be added inside” class name is DocumentParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 while (token != XContentParser.Token.END_OBJECT) {
 if (token == XContentParser.Token.FIELD_NAME) {
 currentFieldName = parser.currentName();
 paths = splitAndValidatePath(currentFieldName);
 if (context.mapperService().isMetadataField(context.path().pathAsText(currentFieldName))) {
 throw new MapperParsingException("Field [" + currentFieldName + "] is a metadata field and cannot be added inside"
 + " a document. Use the index API request parameters.");
 } else if (containsDisabledObjectMapper(mapper; paths)) {
 parser.nextToken();
 parser.skipChildren();
 }

 

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