Value must be of type String: ” + parameterName + ” – 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 ” Value must be of type String: ” + parameterName + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: reindex and index.

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 “Value must be of type String: [” + parameterName + “]”classname  is RestUpdateByQueryAction.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Object parameterValue = entry.getValue();
 if (Script.LANG_PARSE_FIELD.match(parameterName; LoggingDeprecationHandler.INSTANCE)) {
 if (parameterValue instanceof String || parameterValue == null) {
 lang = (String) parameterValue;
 } else {
 throw new ElasticsearchParseException("Value must be of type String: [" + parameterName + "]");
 }
 } else if (Script.PARAMS_PARSE_FIELD.match(parameterName; LoggingDeprecationHandler.INSTANCE)) {
 if (parameterValue instanceof Map || parameterValue == null) {
 params = (Map) parameterValue;
 } else {

 

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