Histogram's are keyed by the start value of the bucket, and the width is the interval defined in the aggregation request. So I think this is just a case of seeing the histogram key instead of the original value. If you put a max aggregation inside that bucket I imagine you'd see the original value since there is only one document
Actually is showing only one value because I used a filter to show that particular _doc. But, the plot must show the sum of all _docs. That's why I'm using sum instead of max.
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