Configurable option to lucene index defs to index original (unanalyzed value as well)

It's sometimes useful to have original value being indexed to be stored as a term. One use-case could be like:

• consider a couple of values to be indexed as abc_def, abcdef
• On query, it seems reasonable to get both values for a query for abc*
• On query, at times, it might be useful to expect abc_def for abc_d* or abc_*

Currently, the values would get indexed like:

• abc_def -> [abc], [def]
• abcdef -> [abcdef]
  So, the query abc* would only fetch abcdef, while abc_d* or abc_* won't fetch anything.