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spatial_stats aggregation #14727

@nknize

Description

@nknize

This feature intends to add a spatial_stats metric aggregator designed for computing the most basic descriptive statistics for Exploratory Spatial Data Analysis. Much like the extended_stats aggregator for basic numerical analysis on non-spatial data sets, the spatial_stats aggregator will be specially designed for spatial data sets - specifically operating on geo_point fields. The aggregator will provide the following:

  • Morans I - A measure of global spatial auto-correlation
  • Geary's C - A measure of localized spatial auto-correlation (inversely related to Morans I)
  • Getis-Ord - Hot spot analysis
  • LISA - Indicators of local spatial association

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