Is there a way to see lucene terms used to index geospatial field?

Is there a way to see lucene terms used to index geospatial field?
I got geospatial field and I would like to get list of all the terms used to index it.
Looking at index files those are like
ABABDABD+ADADBADB+ADCADC+ADDADD+BBABAABAA+BABBAB+BACBAC+CCACABCAB+CACCAC+ ...

I would like to be able to get them using rest api

Luke