Elasticsearch: Field stats API skips geo_point fields

[spalger]

Elasticsearch version: master

Plugins installed: none

JVM version: 1.8.0_102

OS version: macOS Sierra

Description of the problem including expected versus actual behavior: fields of type geo_point are not described in the _field_stats output

Steps to reproduce:
sense requests: https://gist.github.com/spalger/72050d99ee9dc5a4ee8d1186e9cc05c9
which results in a matching filter, but no pin.location field listed in the field_stats output

[clintongormley]

@jpountz could you take a look at this?

[jpountz]

The current behaviour of this API is to ignore all fields for which we do not know how to compute stats. Geo points are fixable, but should we add other fields like geo shapes as well as meta fields such as _index? Those are currently ignored as well.

[spalger]

My naive opinion is that all values that work as "field" identifiers in queries or aggregations should be included in the stats.

[javanna]

This seems to have been fixed by #21947. After that though the field stats API has been removed.