I'm not able to index null values for geo_shapes.
The use case is to index several cities and and add the various polygons later.

I insert the cities through a postgres database, so the workaround for now will to remove polygons with null values inside the jdbc river.

It would be nice, if ElasticSearch could handle such data properly.

I posted some sample data in the following gist.
https://gist.github.com/mgruel/5055147

Best regards,
Meykel