e.g. https://en.wikipedia.org/wiki/Special:Nearby#/page/Empire_State_Building
vs. https://en.wikipedia.org/wiki/Special:Nearby#/coord/40.748433,-73.985656
must_not is added to the query to filter out the document based on _id (page id)
this causes somewhat odd and unexpected results, vs. searching based on coordinates.
(also note that when searching based on a page, the coordinates get passed to elasticsearch as a string and not sure that is desired, though elastic seems to handle it ok)