code: public void deleteTermIndexColumn(TableDefinition tableDef, DBObject dbObj, String fieldName, String term) {
          deleteColumn(SpiderService.termsStoreName(tableDef),
                       SpiderService.termIndexRowKey(tableDef, dbObj, fieldName, term),
                       dbObj.getObjectID());
      }
docs: Un-index the given term by deleting the Terms column for the given DBObject, field
  name, and term.
  
  @param tableDef  {@link TableDefinition} of table that owns object.
  @param dbObj     DBObject that owns field.
  @param fieldName Field name.
  @param term      Term being un-indexed.