I'm using Elasticsearch with search api. And when configuring the leaflet module with my index I didn't see any results in my map. The field type for my indexed GeoField is String (but same issue on Full Text). The problem occurs in the leafletProcessGeofield function where $this->geoPhpWrapper->load is called. It doens't recognize my data as a GeoType. This is because my data is in lowercase "point(4.456855 51.262471)" but the function only recongizes it as uppercase so it should be "POINT(4.456855 51.262471)".
I made a small adjustment to alter the result to uppercase.
There might be something wrong in my configuration but don't see what, this fixed my problem and I don't see further issues with making it uppercase.
Needs review
10.2
Code
Thanks! Maybe you could use the Gitlab workflow, by creating an issue fork and an MR? Then it can also get tested, and follow the ordinary process.