Function score query returned an invalid score finalScore for doc – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when the function score query in OpenSearch returns an invalid score for a document. This could be due to incorrect query syntax, a bug in the scoring function, or an issue with the document data. To resolve this, you can first check the query syntax and ensure it’s correct. If the syntax is correct, try to debug the scoring function to identify any potential issues. Lastly, verify the document data for any inconsistencies or errors that might be causing the function score query to return an invalid score.

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This guide will help you check for common problems that cause the log ” function score query returned an invalid score: ” + finalScore + ” for doc: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: query, lucene, search.

Log Context

Log “function score query returned an invalid score: ” + finalScore + ” for doc: ” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (finalScore < 0f || Float.isNaN(finalScore)) {
 These scores are invalid for score based {@link}s.
 See {@link} for details.
 throw new OpenSearchException("function score query returned an invalid score: " + finalScore + " for doc: " + docId);
 return finalScore;
 }  protected double computeScore(int docId; float subQueryScore) throws IOException {


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