Malformed – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch receives a request that doesn’t comply with its expected format or syntax. This could be due to incorrect query structure, wrong field names, or inappropriate data types. To resolve this, first, check the syntax of your request to ensure it’s correct. Secondly, verify that the field names and data types in your request match those in your OpenSearch index. Lastly, ensure that the data you’re trying to input is compatible with your index schema.

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This guide will help you check for common problems that cause the log ” malformed [ ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: aggregations, search.

Log Context

Log “malformed [” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (Double.isNaN(lon)) {
 lon = parser.doubleValue();
 } else if (Double.isNaN(lat)) {
 lat = parser.doubleValue();
 } else {
 throw new ParsingException(parser.getTokenLocation(); "malformed [" + ORIGIN_FIELD.getPreferredName()
 + "]: a geo point array must be of the form [lon; lat]");
 return new GeoPoint(lat; lon);


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