Runtime must be a map type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.11-8.9

Briefly, this error occurs when Elasticsearch encounters a non-map type value while expecting a map type. This usually happens when you’re trying to define a runtime field in an index template or a mapping, and the provided value is not a map. To resolve this issue, ensure that the runtime field definition is a map type. This means it should be a collection of key-value pairs enclosed in curly braces. Also, check the syntax and structure of your Elasticsearch query or mapping to ensure it’s correct.

This guide will help you check for common problems that cause the log ” runtime must be a map type ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “runtime must be a map type” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (fieldNode instanceof Map) {
 Map fields = RuntimeField.parseRuntimeFields((Map) fieldNode; parserContext; true);
 return true;
 } else {
 throw new ElasticsearchParseException("runtime must be a map type");
 return false;