Adds GeoJSON format to geopoint (#1806)

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

_opensearch/supported-field-types/geo-point.md

@@ -80,6 +80,17 @@ PUT testindex1/_doc/5
 }
 ```
 
+- GeoJSON format, where the `coordinates` are in the [`longitude`, `latitude`] format
+
+```json
+PUT testindex1/_doc/6
+{
+  "point": {
+    "type": "Point",
+    "coordinates": [74.00, 40.71]
+}
+```
+
 ## Parameters
 
 The following table lists the parameters accepted by geopoint field types. All parameters are optional.