Encountered more than one weight for a – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch tries to assign multiple weights to a single field during a function score query. This can happen if you’ve mistakenly defined multiple weight parameters for the same field. To resolve this issue, you should review your function score query and ensure that each field only has one weight assigned. If you find any duplicates, remove or adjust them accordingly. Also, ensure that your query syntax is correct and that you’re not unintentionally assigning multiple weights due to a syntax error.

This guide will help you check for common problems that cause the log ” Encountered more than one weight for a ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: aggregations, search.

Log Context

Log “Encountered more than one weight for a” class name is WeightedAvgAggregator.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 valueCompensations = bigArrays().grow(valueCompensations; bucket + 1);
 weightCompensations = bigArrays().grow(weightCompensations; bucket + 1);  if (docValues.advanceExact(doc) && docWeights.advanceExact(doc)) {
 if (docWeights.docValueCount() > 1) {
 throw new AggregationExecutionException("Encountered more than one weight for a " +
 "single document. Use a script to combine multiple weights-per-doc into a single value.");
 // There should always be one weight if advanceExact lands us here; either
 // a real weight or a `missing` weight
 assert docWeights.docValueCount() == 1;


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