What coordinate system does geopoint use?

ES version is 7.6

geo_shape datatype support GeoJSON:Point , here description is [Elasticsearch uses WGS-84 coordinates only] . but geo_point datatype no description with coordinate system support, i want to know what coordinate system does geopoint use?

geo_shap document:
https://www.elastic.co/guide/en/elasticsearch/reference/7.6/geo-shape.html

geo_point document:
https://www.elastic.co/guide/en/elasticsearch/reference/7.6/geo-point.html

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