Solr Indexing is good but old one without having any improvements.
Now every industry generates lot of data in Windchill and number of users keep increasing.
With a drastic increase in data, users are finding difficulty in getting the relevant results on Keyword search.
And I keep hearing from users that they are hating Windchill search because they get thousands of results. It is ok to give so many results, but it is good to give more relevant information at starting - like google search results.
I believe, to resolve this search, either PTC should introduce Artificial intelligence into Solr Index architecture or should support some Enterprise search solutions like Google Enterprise search.