try centroid aggregation after geohash aggregation
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@pieterprovoost is already working on this.
Since Feb 21, 2018.
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Description
Adding a centroid subaggregation after the geohash grid aggregation may improve the visual appearance of point tiles, and may even allow doing coarser aggregations (which will improve client side performance).
See https://github.com/elastic/elasticsearch/issues/13912 and https://blog.trifork.com/2014/03/26/server-side-clustering-of-geo-points-on-a-map-using-elasticsearch-continued/
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