For the initial release of the geotile_grid aggregation, the tiles-lat/lon translations uses
functions like atan(), sinh(), and sin().

org.apache.lucene.util.SloppyMath is used at times when approximate trig functions
using cos/sin tables are sufficient. This issue is open to explore the use of similar
approximate methods and benchmark whether it makes sense to enable the usage
of them within the aggregation to help speed the calculations