Following is the morphia query:

final Query<Node> getNodesQuery = datastore.createQuery(Node.class).
field("point.coordinates").near(-71.097825, 42.386532);//, radius);
return getNodesQuery.asList();

Following is the shell query:
db.nodes.find( { point : { $near : { $geometry :

{ type : "Point" , coordinates : [-71.097825, 42.386532] }

, $maxDistance : 50 } } } )

And the error:
Exception in thread "main" com.mongodb.MongoQueryException: Query failed with error code 17007 and error message 'Unable to execute query: error processing query: ns=nodal_scoring_db_v2.nodes limit=0 skip=0
Tree: GEONEAR field=point.coordinates maxdist=1.79769e+308 isNearSphere=0
Sort: {}
Proj: {}
planner returned error: unable to find index for $geoNear query'