Unknown key for a token in currentFieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch encounters an unknown field in the request body. This could be due to a typo in the field name, or the field might not exist in the mapping. To resolve this issue, you should first check the field name for any spelling mistakes. If the spelling is correct, verify that the field exists in the mapping. If it doesn’t, you may need to add it. Alternatively, if the field is not required, you can simply remove it from the request.

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This guide will help you check for common problems that cause the log ” Unknown key for a ” + token + ” in [” + currentFieldName + “]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

Log Context

Log “Unknown key for a ” + token + ” in [” + currentFieldName + “].” class name is FetchSourceContext.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ParsingException(parser.getTokenLocation(); "Unknown key for a " + token
 + " in [" + currentFieldName + "]."; parser.getTokenLocation());
 }
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Unknown key for a " + token + " in [" + currentFieldName + "].";
 parser.getTokenLocation());
 }
 }
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Expected one of [" + XContentParser.Token.VALUE_BOOLEAN + "; "

 

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