[Maps][File upload] Retain Data Shape when Uploading GeoJSON

[dsadosky]

Retain the structure of the uploaded geojson documents) when using the file upload tool. Currently, the upload tool flattens the geojson structure (removing the "properties" object and moving all items under properties to the root level. The uploader also renames the standard "geometry" key to coordinates both of which make the ingested data no longer geojson compliant.

Either retain the shape/structure of the uploaded data and/or provide the ability to provide customer mappings and ingest pipelines similar to other upload tooling (ie. Data Analyzer)

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[kindsun]

Related to #40197

[nreese]

Closing.

Flattening properties is intentional so the data is easier to work with in Kibana. The original GeoJSON shape is not preserved because there is no elasticsearch API that can return a FeatureCollection so it does not makes sense to preserve the original shape of the data at the expense of ease-of-use in Kibana.

Either retain the shape/structure of the uploaded data and/or provide the ability to provide customer mappings and ingest pipelines similar to other upload tooling (ie. Data Analyzer)

#120023 renamed coordinates to geometry.

Please track customer mappings and ingest pipelines with #40197