Properties must be a map 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 Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” properties 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.

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

return true;
 } else if (fieldName.equals("properties")) {
 if (fieldNode instanceof Collection && ((Collection) fieldNode).isEmpty()) {
 // nothing to do here; empty (to support "properties: []" case)
 } else if (!(fieldNode instanceof Map)) {
 throw new ElasticsearchParseException("properties must be a map type");
 } else {
 parseProperties(builder; (Map) fieldNode; parserContext);
 return true;
 } else if (fieldName.equals("include_in_all")) {


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