I'm trying to filter vertices with point properties based on distance, similar to the example at the bottom of the Using search indexes section of the docs:
A query can find all sensors that meet the requirement of being inside the described polygon Distance that is designated as a circle with a center at (-110, 30) and a radius of 20 units with the method Geo.inside().
The "units" used for the radius are actually degrees. What I would like is to find the points within a certain radius in kilometers.
This is apparently supported by Solr, (see distanceUnitshere) and is even the default in the upstream distribution. I tried to change schema.xml to set distanceUnits=kilometers in the configuration for RPT, but then the solr core threw the following exception on reload:
org.apache.solr.common.SolrException: Must specify units="degrees" on field types with class SpatialRecursivePrefixTreeFieldType
In DSE5 we are running solr 4.10.3.2.1133 here the only valid type for Units in this version is degrees as we can see from the code . Units was the predecessor to distanceUnits. In the meantime you may find this helpful.