Could not parse field. expected a string array but found value instead – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” could not parse field. expected a string array but found value instead ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “could not parse [{}] field. expected a string array but found [{}] value instead”classname  is XContentUtils.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

}
 throw new ElasticsearchParseException("could not parse [{}] field. expected a string array but found null value instead";
 parser.currentName());
 }
 if (parser.currentToken() != XContentParser.Token.START_ARRAY) {
 throw new ElasticsearchParseException("could not parse [{}] field. expected a string array but found [{}] value instead";
 parser.currentName(); parser.currentToken());
 } 
 List list = new ArrayList<>();
 XContentParser.Token token;

 

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