The new version of the mint2 system now has build in support for solr. It utilizes either an embedded solr server, if a data directory for solr is configured in the mint.properties, or it uses a Solr Server via a configured http URL. If neither is configured, there is no solr support.
Together with this, there is now automatically Solr indexing on upload, transformation (and re-itemizing). The ItemBrowser widget on the client contains a field that allows the search of the viewed Dataset for labels, full text or complete custom solr query, where you can specify fieldnames and logic operators. A search over multiple Datasets, although off course possible from solr point of view, is not yet integrated into the UI, neither is support for facetted search.