Can t round a histogram – 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’re trying to round a histogram in Elasticsearch, which is not possible because histograms are used to group numeric data into ranges. To resolve this issue, you can either remove the rounding function or convert the histogram into a data type that can be rounded. Alternatively, you can use the “interval” parameter to define the width of the histogram’s buckets, which can give a similar effect to rounding.

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This guide will help you check for common problems that cause the log ” can’t round a [histogram] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, aggregations.

Log Context

Log “can’t round a [histogram]” class name is HistogramValuesSource.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public abstract HistogramValues getHistogramValues(LeafReaderContext context) throws IOException;  @Override
 public Function roundingPreparer(AggregationContext context) throws IOException {
 throw new AggregationExecutionException("can't round a [histogram]");
 }  public static class Fielddata extends Histogram {  protected final IndexHistogramFieldData indexFieldData;

 

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