Correction of the the unit option for the GeoDistance filter (changed fr... #371
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This change fixes the unit option on the GeoDistance filter. There was an error in the Elasticsearch documentation stating that the parameter for specifying the distance unit was "distance_unit", however it is actually just "unit". This has since been corrected (See: elastic/elasticsearch#2771), but NEST was using the incorrect "distance_unit" parameter. Before this change, specifying the distance unit would cause Elasticsearch to throw a parsing exception. I've tested and confirmed this change in my application and have updated the unit test accordingly.