@Override public InternalAggregation buildAggregation(long owningBucketOrdinal) { assert owningBucketOrdinal == 0; List<HistogramBase.Bucket> buckets = new ArrayList<HistogramBase.Bucket>((int) bucketOrds.size()); for (long i = 0; i < bucketOrds.capacity(); ++i) { final long ord = bucketOrds.id(i); if (ord < 0) { continue; // slot is not allocated } buckets.add( histogramFactory.createBucket( rounding.valueForKey(bucketOrds.key(i)), bucketDocCount(ord), bucketAggregations(ord))); } CollectionUtil.introSort(buckets, order.comparator()); // value source will be null for unmapped fields ValueFormatter formatter = valuesSource != null ? valuesSource.formatter() : null; AbstractHistogramBase.EmptyBucketInfo emptyBucketInfo = minDocCount == 0 ? new AbstractHistogramBase.EmptyBucketInfo(rounding, buildEmptySubAggregations()) : null; return histogramFactory.create( name, buckets, order, minDocCount, emptyBucketInfo, formatter, keyed); }