code: public Set<String> extractTerms(String value) {
          try {
  	        Set<String> result = new HashSet<String>();
      		Set<String> split = Utils.split(value.toLowerCase(), CommonDefs.MV_SCALAR_SEP_CHAR);
      		for(String s : split) {
      			String[] tokens = tokenize(s);
  		        for (String token : tokens) {
  		            if (token.length() == 0) continue;
  		            result.add(token);
  		        }
      		}
  	        return result;
          } catch (Exception e) {
              // Turn into an IllegalArgumentException
              throw new IllegalArgumentException("Error parsing field value: " + e.getLocalizedMessage());
          }
      }
docs: Analyze the given String value and return the set of terms that should be indexed.
  
  @param value Field value to be indexed as a binary value.
  @return      Set of terms that should be indexed.