Unexpected parameter – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when an unexpected or unrecognized parameter is passed in an Elasticsearch query or command. This could be due to a typo, incorrect syntax, or use of a parameter that doesn’t exist or isn’t supported in the current version of Elasticsearch. To resolve this issue, you should first check the command or query for any typos or syntax errors. If that doesn’t work, verify that the parameter you’re using is supported in your version of Elasticsearch. If the parameter is deprecated, you may need to update your command or query to use a supported parameter.

This guide will help you check for common problems that cause the log ” Unexpected parameter ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, plugin.

Log Context

Log “Unexpected parameter” class name is ExpressionBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  Token token = node.getSymbol();  if (params.containsKey(token) == false) {
 throw new ParsingException(source(node); "Unexpected parameter");
 }  return params.get(token);


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