proj:* cannot be indexed as geo field

[StijnCaerts]

Elasticsearch only supports WGS-84 coordinates in geo_shape or geo_point fields.
Therefore, these fields should not be indexed.

https://www.elastic.co/guide/en/elasticsearch/reference/current/geo-shape.html

https://github.com/stac-utils/stac-fastapi-elasticsearch/blob/2fdabc255f34ca8d919572fb1af33b52bf3dfadd/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py#L67-L78