Solr is good software. Hibernate is good software, and with Hibernate Search it uses Lucene for full text search.
It’s possible to configure Solr to use arbitrary Lucene indexes. I think it would be great if someone (else!) would do the work to configure Solr to work with Hibernate Search.
I doubt any work is required. As long as schema in solr configuration is same. One would theoretically just set index directory in solrconfig.xml to where ever hibernate stores data.