elasticsearch/elasticsearch — pull request #2026 by chrismale (2012-06-15 13:40:11+00:00)
Title: Test that verifies behavior of GeoDistance.ARC and GeoDistance.PLANE distance calculation

Included test which verifies the differences in the distance calculations of GeoDistance.ARC and GeoDistance.PLANE, showing why this could cause elliptical results. Some small tidy up of the test class too.