Cannot cast value of type to parameter type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-7.15

Briefly, this error occurs when Elasticsearch tries to convert a value of one data type to another incompatible data type. This is common when inserting data into an index where the field’s data type doesn’t match the provided value’s data type. To resolve this, ensure that the data types of the values being inserted match the data types defined in the index mapping. Alternatively, you can update the index mapping to match the data type of the incoming values. Be cautious as changing the mapping can have implications on how data is stored and searched.

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: plugin, parser.

Log Context

Log “Cannot cast value [{}] of type [{}] to parameter type [{}]” class name is 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;
 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);