Unsupported 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 unrecognized or unsupported token in a query. This could be due to a syntax error, incorrect field name, or an unsupported character. To resolve this issue, you should first check your query for any syntax errors or typos. If the syntax is correct, verify that the field names used in the query match those in your index. Lastly, ensure that you’re not using any special characters that Elasticsearch doesn’t support.

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

Log Context

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

 password = WatcherXContentParser.secretOrNull(parser);
 } else {
 throw new ElasticsearchParseException("unsupported field [" + fieldName + "]");
 } else {
 throw new ElasticsearchParseException("unsupported token [" + token + "]");
 }  if (username == null) {
 throw new ElasticsearchParseException("username is a required option");


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