Docs: Add description of the coerce parameter in geo_shape mapper
Explains the effect of the coerce parameter on the geo_shape field.
Relates
@@ -108,6 +108,8 @@ geo-points containing any more than latitude and longitude (two dimensions) valu
and reject the whole document.
| `true`
+|`coerce` |If `true` unclosed linear rings in polygons will be automatically closed.
+| `false`
|=======================================================================
