Dense ords don t know how to collect from many buckets – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-8.9

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Briefly, this error occurs when you are trying to use a feature in Elasticsearch that is not supported by dense ords. Dense ords are a type of data structure used in Elasticsearch for storing and retrieving data. They are not designed to collect data from multiple buckets at once. To resolve this issue, you could try to restructure your query to collect data from one bucket at a time, or consider using a different data structure that supports collecting from multiple buckets. Alternatively, you could try to reduce the number of buckets you are collecting from.

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This guide will help you check for common problems that cause the log ” Dense ords don’t know how to collect from many buckets ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, aggregations.

Log Context

Log “Dense ords don’t know how to collect from many buckets” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (remapGlobalOrds) {
 this.collectionStrategy = new RemapGlobalOrds(cardinality);
 } else {
 this.collectionStrategy = -> {
 if (estimate > 1) {
 throw new AggregationExecutionException("Dense ords don't know how to collect from many buckets");
 return new DenseGlobalOrds();


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