NAME unknown token token – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected token in the query. This could be due to a syntax error, incorrect field name, or unsupported operation. To resolve this, first, check your query for any syntax errors. Ensure that all field names used in the query exist in your index. Lastly, verify that all operations used in the query are supported by your version of Elasticsearch.

This guide will help you check for common problems that cause the log ” [” + NAME + “] unknown token [” + token + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “[” + NAME + “] unknown token [” + token + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  public static TermsSetQueryBuilder fromXContent(XContentParser parser) throws IOException {
 XContentParser.Token token = parser.nextToken();
 if (token != XContentParser.Token.FIELD_NAME) {
 throw new ParsingException(parser.getTokenLocation(); "[" + NAME + "] unknown token [" + token + "]");
 String currentFieldName = parser.currentName();
 String fieldName = currentFieldName;  token = parser.nextToken();


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