Cannot cast value of type to parameter type – 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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Cannot cast value of type to parameter type ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser and plugin.


Log Context

Log “Cannot cast value [{}] of type [{}] to parameter type [{}]”classname  is ExpressionBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

return new Literal(source; param.value; dataType);
 }
 // otherwise we need to make sure that xcontent-serialized value is converted to the correct type
 try {
 if (canConvert(sourceType; dataType) == false) {
 throw new ParsingException(source; "Cannot cast value [{}] of type [{}] to parameter type [{}]"; param.value; sourceType;
 dataType);
 }
 return new Literal(source; converterFor(sourceType; dataType).convert(param.value); dataType);
 } catch (QlIllegalArgumentException ex) {
 throw new ParsingException(ex; source; "Unexpected actual parameter type [{}] for type [{}]"; sourceType; param.type);

 

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