Malformed score function score parameters – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when the parameters provided to the score function in Elasticsearch are incorrect or not properly formatted. This could be due to a syntax error, incorrect field name, or wrong data type. To resolve this issue, you should first verify the syntax of your query. Make sure that the field names and data types match those in your Elasticsearch index. If the error persists, try to simplify your query or break it down to isolate the problematic part. Lastly, ensure that your Elasticsearch version supports the score function you are using.

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This guide will help you check for common problems that cause the log ” malformed score function score parameters. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “malformed score function score parameters.” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 functionBytes = BytesReference.bytes(builder);
 } else if (MULTI_VALUE_MODE.match(currentFieldName; parser.getDeprecationHandler())) {
 multiValueMode = MultiValueMode.fromString(parser.text());
 } else {
 throw new ParsingException(parser.getTokenLocation(); "malformed score function score parameters.");
 if (fieldName == null || functionBytes == null) {
 throw new ParsingException(parser.getTokenLocation(); "malformed score function score parameters.");


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