Does the PatternReplaceFilter have an option where you can keep the original token in addition to the modified token? From what I looked at it does not seem to but I want to confirm the same.
Alternatively, is there a filter available which takes in a pattern and produces additional forms of the token depending on the pattern? The use case I am looking at here is using such a filter to automate synonym generation. In our application, quite a few of the synonym file entries match a specific pattern and having such a filter would make it easier I believe. Pl. do correct me in case I am missing some unwanted side-effect with this approach. Continuing on that line, what is the performance hit in having additional index-time filters as opposed to using a synonym file with more entries? How does the overhead of using a bigger synonym file as opposed to additional filters compare? Thanks in advance for the help. Regards, Prasanna.
