Unsupported field fieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when you are trying to use a field in Elasticsearch that is not supported or does not exist in the index mapping. This could be due to a typo in the field name or the field might not have been defined in the mapping. To resolve this issue, you can check the field name for any typos or check the index mapping to ensure the field is defined. If the field is not defined, you can add it to the mapping using the PUT mapping API.

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This guide will help you check for common problems that cause the log ” unsupported field [” + fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “unsupported field [” + fieldName + “]” class name is BasicAuth.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (Field.USERNAME.getPreferredName().equals(fieldName)) {
 username = parser.text();
 } else if (Field.PASSWORD.getPreferredName().equals(fieldName)) {
 password = WatcherXContentParser.secretOrNull(parser);
 } else {
 throw new ElasticsearchParseException("unsupported field [" + fieldName + "]");
 } else {
 throw new ElasticsearchParseException("unsupported token [" + token + "]");


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