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

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters a data type mismatch while indexing a document. Specifically, it expects the “properties” field to be a map (key-value pairs), but it’s receiving a different data type. To resolve this, ensure that the data structure of the “properties” field in your document matches the mapping defined in your index. If the mapping is not defined, ensure that the “properties” field is a map type. Also, check for syntax errors or incorrect nesting of fields. If necessary, redefine your index mapping to match your document structure.

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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.

Log Context

Log “properties must be a map type” class name 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) == false) {
 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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