Yes, you can copyField the source's contents to another field, use the
KeepWordTokenFilter to keep only those words you really care about. Using
(e)dismax you can then apply a heavy boost on the field. All special words in
that field will show up higher if queried for.
-Original message--
Can you provide sample structure of the document with entities, how does the
document look like?.
As far as I can assume, you do not need to apply any filters. If you are
entities are searchable include them in the fulltext or keyword research.
Is your entities are part of the document and are they