Loding indexkmiweb07mysql in Luke to find the schema

Following http://stackoverflow.com/questions/2715973/can-a-raw-lucene-index-be-loaded-by-solr , get Luke to analyze the schema .
http://www.getopt.org/luke/
https://code.google.com/archive/p/luke/downloads?page=2

Downloading 0.9.9.1.jar from Google Code and loading

/var/lib/tomcat7/webapps/poweraqua/LuceneIndexes/indexkmiweb07mysql/

gives the following fields:

URI, end1, end2, end3, end4, entityLabel, entityType, gram1, gram2, gram3, gram4, indexField, pluginID, start1, start2, start3, start4, word