Expected map for property fields on field propNode or – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch expects a map (key-value pair) for the property [fields] on a certain field, but it doesn’t find it. This usually happens due to incorrect data structure or syntax in the query. To resolve this issue, you can: 1) Review your query and ensure that the [fields] property is correctly formatted as a map. 2) Check if the field exists in your index. 3) Ensure that the field is not analyzed if you’re using it for aggregations or sorting. 4) Update your mapping if the field type is incorrect.

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This guide will help you check for common problems that cause the log ” expected map for property [fields] on field [” + propNode + “] or ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, node.

Log Context

Log “expected map for property [fields] on field [” + propNode + “] or ” class name is TypeParsers.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (propNode instanceof List && ((List) propNode).isEmpty()) {
 multiFieldsPropNodes = Collections.emptyMap();
 } else if (propNode instanceof Map) {
 multiFieldsPropNodes = (Map) propNode;
 } else {
 throw new MapperParsingException("expected map for property [fields] on field [" + propNode + "] or " +
 "[" + propName + "] but got a " + propNode.getClass());
 }  for (Map.Entry multiFieldEntry : multiFieldsPropNodes.entrySet()) {
 String multiFieldName = multiFieldEntry.getKey();

 

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