Can I use Lucene to access the index generated by SOLR?
Yes, although this is not recommended. Writing to the index is particularly tricky. However, if you do go down this route, there are a couple of things to keep in mind. Be careful that the analysis chain you use in Lucene matches the one used to index the data or you’ll get surprising results. Also, be aware that if you open a searcher, you won’t see changes that Solr makes to the index unless you reopen the underlying readers.